Free

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...(updated: 221231)...
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...(3D):-
NetRadiant - http://ingar.intranifty.net/gtkradiant/ / https://github.com/Garux/netradiant-custom/releases / http://icculus.org/netradiant/files/ / http://www.q3rally.com/2019/07/24/netradiant-builds-from-illwieckz/ / https://netradiant.gitlab.io/page/download/
DarkRadiant - http://darkradiant.sourceforge.net/
GtkRadiant - http://icculus.org/gtkradiant/
Blender - http://www.blender.org/ / https://www.bforartists.de/download/ / https://sourceforge.net/projects/winpenpack/files/X-Blender/releases/
MeshLab - http://meshlab.sourceforge.net/
Wings3D - http://www.wings3d.com/
OpenFX - http://www.openfx.org/
K-3D - http://www.k-3d.org/
Art of Illusion - http://www.artofillusion.org/
Misfit Model 3D - http://www.misfitcode.com/misfitmodel3d/ / https://sourceforge.net/projects/misfitcubed/
Seamless3D - http://www.seamless3d.com/
Sculptris - http://pixologic.com/sculptris/ ( http://www.violationentertainment.com/files/software/Sculptris_Installer_WIN.exe )
Open3mod - http://www.open3mod.com/
Assimp - http://www.assimp.org/
gMax - http://www.turbosquid.com/gmax ( http://www.violationentertainment.com/files/software/gMAX%201.2%20&%20Tempest.zip )
FreeCAD - https://www.freecadweb.org/
BRL-CAD - https://sourceforge.net/projects/brlcad/
DoubleCAD XT - https://www.turbocad.com/content/doublecad-xt-v5
Kerkythea - https://www.kerkythea.net/cms/index.php/downloads
Noesis - https://richwhitehouse.com/index.php?content=inc_projects.php
Dilay - https://abau.org/dilay/download.html
Makehuman - http://www.makehuman.org/
OpenFlipper - https://www.openflipper.org/
View3Dscene - https://castle-engine.io/view3dscene.php
Meshmixer - http://www.meshmixer.com/
MeshMapper - https://gpuopen.com/archive/gamescgi/amd-gpu-meshmapper/
Soclab ORB - https://www.nexusmods.com/doom3/mods/720 ( http://www.violationentertainment.com/files/software/ORB%201.83.zip )
RenderMonkey - https://gpuopen.com/archive/gamescgi/rendermonkey-toolsuite/
QuArK - http://quark.sourceforge.net/
Hammer - https://gamebanana.com/tools/5026
DENormGen - https://epsylon.rptd.ch/downloads.php
TrenchBroom - https://trenchbroom.github.io/ / https://github.com/RobertBeckebans/TrenchBroom
J.A.C.K - https://jack.hlfx.ru/en/
4D Blue - http://www.4dblue.com/download.html
sPatch & Hamapatch - http://www.eatonhand.com/images/spatch.htm
Regard3D - http://www.regard3d.org/
Real3D Renderer - https://real3d.pk/rend.html
Insight3D - http://insight3d.sourceforge.net/ / https://sourceforge.net/projects/insight3dng/
ReDucto - http://psychocore.com/index2.html ( http://www.violationentertainment.com/files/software/ReDucto.zip )
LODka3D - https://sites.google.com/site/lodka3d/
3D Crafter - http://amabilis.com/downloads/
Gloss3D - https://sourceforge.net/projects/gloss3d/files/
Freyja - http://icculus.org/freyja/
Aztec3D - https://sourceforge.net/projects/aztec/
Mapscape - http://www.evolved-software.com/mapscape/mapscapeold
Tree It - http://www.evolved-software.com/treeit/treeit
Arbaro - http://arbaro.sourceforge.net/
PlantStudio - https://www.kurtz-fernhout.com/download.htm
GRASS GIS - https://grass.osgeo.org/
Neobarok - http://neobarok.com/#download
Biturn - http://mirex.mypage.sk/index.php?selected=1
AliceVision Meshroom - https://alicevision.github.io/#meshroom
Artifex Terra 3D - http://www.artifexterra.com/
OpenSCAD - https://www.openscad.org/downloads.html
NaroCAD - http://narocad.com/downloads/
Anim8or - http://www.anim8or.com/
Ayam - http://ayam.sourceforge.net/ayam.html
Ivy Generator - http://graphics.uni-konstanz.de/~luft/ivy_generator/
Tokoroten - http://kanae.net/secondlife/tokoroten.html
SL-Prim-Lathe - http://sl-prim-lathe.bashora.com/
Sweet Home 3D - http://www.sweethome3d.com/
HUMmer - https://sourceforge.net/projects/hummer/files/
TreeBuilder - https://sourceforge.net/projects/treebuilder/
PTree - https://sourceforge.net/projects/procedural-tree-generator/
ngPlant - http://ngplant.org/
Draw3D - https://sourceforge.net/projects/draw3d/
Dust3D - https://dust3d.org/
Clavicula - https://www.neobarok.com/ ( http://www.violationentertainment.com/files/software/CLAVICULA-0.9.8.2-win.zip )
Picogen - https://picogen.org/downloads.php.html
Wilbur - http://www.ridgenet.net/~jslayton/software.html ( http://www.violationentertainment.com/files/software/Wilbur64_Setup.msi )
gSculpt - http://gsculpt.sourceforge.net/
gCAD3D - http://www.gcad3d.org/
Getic3D - http://marius.mine.nu/index.php?f=1_Getic-3D/8_Downloads.php ( http://www.violationentertainment.com/files/software/getic-nov2008.rar )
3D Slash - https://www.3dslash.net/features_downloads.php
MeshMagic 3D - http://www.nchsoftware.com/meshmagic3d/
ModelConverterX - https://www.fsdeveloper.com/forum/resources/modelconverterx.91/
ProgMesh - http://lodbook.com/products/progmesh.exe
zModeler2 - https://www.indiedb.com/downloads/zmodeler2
TerreSculptor - http://www.demenzunmedia.com/home/terresculptor/
Sculptypaint - http://elout.home.xs4all.nl/sculptpaint/
Calimax Modeller - https://www.indiedb.com/downloads/calimax-modeller
Softimage Mod Tool - https://www.indiedb.com/engines/source/downloads/autodesk-softimage-mod-tool-75 / https://www.indiedb.com/groups/source-developers/downloads/xsi-mod-tool-601
Ohmikron Model Editor - https://sourceforge.net/projects/my3dmodeleditor/
Boundary First Flattening - https://geometrycollective.github.io/boundary-first-flattening/
Clockstone ViewFBX - http://fbx.clockstone.com/fbx-viewer-download.html
Auto Remesher - https://github.com/huxingyi/autoremesher/releases
POV-Ray - https://www.indiedb.com/downloads/pov-ray-windows-64-bit / https://www.indiedb.com/downloads/pov-ray-windows-32-bit
GLC-Player - http://www.glc-player.net/ ( http://www.violationentertainment.com/files/software/GLC_Player_2.2.0-setup.exe )
FBX converter - https://www.autodesk.com/developer-network/platform-technologies/fbx-converter-archives
.
_

...(2D):-
GIMP - http://www.gimp.org/
ImageMagick - http://www.imagemagick.org/
Inkscape - https://inkscape.org/en/download/
Quixel Mixer - https://quixel.com/mixer
Chasys Draw IES - http://www.jpchacha.com/chasysdraw/index.php
Krita - https://krita.org/en/
MyPaint - http://mypaint.org/
Paint.NET - https://www.getpaint.net/download.html
XnView - http://www.xnview.com/
IrfanView - https://www.irfanview.com/
xNormal - http://www.xnormal.net/
Spacescape - http://alexcpeterson.com/spacescape/
CubemapGen - https://gpuopen.com/archive/gamescgi/cubemapgen / https://code.google.com/archive/p/cubemapgen/downloads
nVidia Melody - http://www.nvidia.com/object/melody_home.html ( http://www.violationentertainment.com/files/software/Melody_1.2.0630.1500.exe )
Howler - http://www.pdhowler.com/Download.htm
MaPZone - http://www.mapzoneeditor.com/ ( http://www.violationentertainment.com/files/software/MaPZone2_2_6_1a.exe )
NeoTextureEdit - http://neotextureedit.sourceforge.net
NormalmapGenerator - https://github.com/Theverat/NormalmapGenerator/releases
Evolved Texture Tool - http://www.evolved-software.com/texturetool/texturetool
Compressonator - http://developer.amd.com/tools-and-sdks/archive/legacy-cpu-gpu-tools/the-compressonator/ ( http://www.violationentertainment.com/files/software/Compressonator%201.50.zip ) ( https://www.katsbits.com/files/Compressonator_for_DOOM3.zip )
Aorta DDS - https://sourceforge.net/projects/aorta/files/
nCombiner - http://www.planetinaction.com/software/ncombiner.htm ( http://www.violationentertainment.com/files/software/ncombiner.zip )
Dia - https://wiki.gnome.org/Apps/Dia/Download
Cas - http://www.zhornsoftware.co.uk/cas/index.html
TileMage - http://tilemage.50webs.com/
GlueIT - https://github.com/Kavex/GlueIT
ImageJ - https://imagej.nih.gov/ij/download.html
mtPaint - http://mtpaint.sourceforge.net/
Glaxnimate - https://glaxnimate.mattbas.org/
BatchBlitz - https://www.sunlitgreen.com/batchblitz.html
FireAlpaca - https://firealpaca.com/
Photo Pos Pro - http://www.photopos.com/PPP3_BS/Photo-Pos-Pro-Free-Photo-Editor.aspx
Picture Window Pro - https://www.dl-c.com/Downloads.html
Symbiotic 3T - ( http://www.violationentertainment.com/files/software/Symbiotic%203T.zip )
Terabit Tattoo - https://www.terabit-software.co.uk/#TATTOO
ArmorPaint - https://armorpaint.org/index.html
TexGen - https://sourceforge.net/projects/tex-gen/
Pinta - https://pinta-project.com/pintaproject/pinta/
Alchemy - http://al.chemy.org/download/
Pixelitor - http://pixelitor.sourceforge.net/
LazPaint - https://github.com/bgrabitmap/lazpaint/releases
Synfig - https://www.synfig.org
PixaFlux - http://pixaflux.com/
Contort - http://www.graphicutils.com/contort/
MakeAtlas- http://www.skn3.com/junk/makeatlas/makeatlas1.12.zip ( http://www.violationentertainment.com/files/software/makeatlas1.12.zip )
Stykz - https://www.stykz.net/downloads/
FenoPhoto - http://fenophoto.com/
PhotoScape - http://www.photoscape.org/ps/main/index.php
GraphicsGale - https://graphicsgale.com/us/
Ultimate Paint - http://www.ultimatepaint.com/
Nutty TexGen - http://www.nutty.ca/?p=178
FotoSketcher - https://fotosketcher.com/
RealWorld Paint - http://www.rw-designer.com/image-editor
AnmanieSMP - https://www.chip.de/downloads/AnmanieSMP_13002491.html
A Sharper Scaling - http://a-sharper-scaling.com/
Waifu2X Caffe - https://github.com/lltcggie/waifu2x-caffe/releases/
RealEsrgan - https://github.com/xinntao/Real-ESRGAN/releases
PhotoFiltre - http://www.photofiltre-studio.com/pf7-en.htm
Pixia - http://www.ne.jp/asahi/mighty/knight/download.html
TexGraph - https://galloscript.itch.io/texgraph
Kujawiak Viewer - http://kujawiak.sourceforge.net/index_en.html
Pictus - https://poppeman.se/pictus/
Piskel - https://www.piskelapp.com/download
TG - https://blackpawn.com/dev/tg.html
Tiled - https://www.mapeditor.org/
HME - http://hme.sourceforge.net/
RIOT - https://riot-optimizer.com/
G'MIC - https://gmic.eu/
QCAD - https://www.qcad.org/en/
LibreCAD - https://librecad.org/
Materialize - http://boundingboxsoftware.com/materialize/
Material Maker - https://github.com/RodZill4/material-maker/releases
NexusFont - https://www.xiles.app/
StereoPhoto Maker - https://stereo.jpn.org/eng/stphmkr/
Sprite Sheet Packer - https://archive.codeplex.com/?p=spritesheetpacker
Klei Texture Tools - https://github.com/handsomematt/dont-starve-tools/releases
Seamless Factory - https://www.sac.sk/download/graph/sf35.exe ( http://www.violationentertainment.com/files/software/sf35.exe )
Seamless Critters - https://sourceforge.net/projects/seamcritters/
Batch AI Photo Sharpener - https://bggenerator.com/batch_ai_photo_sharpener.html
NiceScaler - https://github.com/Djdefrag/NiceScaler/releases
OpenToonz - https://opentoonz.github.io/e/index.html
PhotoFlare - https://photoflare.io/
PhotoDemon - https://photodemon.org/
PhotoWipe - https://www.hanovsolutions.com/?prod=PhotoWipe
PaintStar - https://sites.google.com/site/wangzhenzhou/
Pencil2D - https://www.pencil2d.org/
Darktable - http://www.darktable.org/
NoiseLab - https://sites.google.com/site/noiselab15/
Imagine - https://www.nyam.pe.kr/dev/imagine/
Laigter - https://azagaya.itch.io/laigter
Lunacy - https://icons8.com/lunacy
VPaint - http://www.vpaint.org/
BirdFont - http://birdfont.org/
Photivo - https://photivo.org/start
Pictor - http://www.filefriend.net/#Pictor
Pixopedia - https://sigmapi-design.com/
PaintTool SAI - http://www.systemax.jp/en/sai/
A Viewer - https://www.rlatour.com/av4w/index.html?ar4w
SpeedyPainter - http://speedypainter.altervista.org/
DynamicDraw - https://dynamicdraw.com/download/
Blend It - http://www.blaizenterprises.com/blendit.html
Clic - http://www.blaizenterprises.com/clic.html
Luminance HDR - http://qtpfsgui.sourceforge.net/
HDRscope - http://courses.washington.edu/hdrscope/download.html
Xlideit - https://sourceforge.net/projects/xlideit/
Picturenaut - http://www.hdrlabs.com/picturenaut/index.html
TextureLab - https://njbrown.itch.io/texturelab
Handplane - http://www.handplane3d.com/download.html
SSbump Generator - https://sourceforge.net/projects/ssbumpgenerator/
AMD Normalmapper - https://gpuopen.com/archive/gamescgi/normal-mapper/
Gimel Studio - https://correctsyntax.com/projects/gimel-studio/#download
AwesomeBump - https://github.com/kmkolasinski/AwesomeBump
Hugin - https://sourceforge.net/projects/hugin/
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...(video):-
FFMPEG - https://ffmpeg.org/
Handbrake - https://handbrake.fr/
Shotcut - https://shotcut.org/
OBS - https://obsproject.com/download
VSDC - http://www.videosoftdev.com/free-video-editor
Vidiot - https://sourceforge.net/projects/vidiot/
OpenShot - https://www.openshot.org/
Avidemux - http://avidemux.sourceforge.net/download.html
VidCutter - https://github.com/ozmartian/vidcutter/releases
SharpCut - https://bagno.jp/software.html
LosslessCut - https://github.com/mifi/lossless-cut/releases
XMedia Recode - https://www.xmedia-recode.de/en/download.php
IObit Screen Recorder - https://recorder.iobit.com/en/index
Auto Screen Capture - https://sourceforge.net/projects/autoscreen/
ShanaEncoder - https://shana.pe.kr/shanaencoder_download
qStopMotion - https://www.qstopmotion.org/
FlowFrames - https://nmkd.itch.io/flowframes
CamStudio - https://camstudio.org/
Natron - https://natrongithub.github.io/
Axiom - https://axiomui.github.io/
Olive - https://olivevideoeditor.org/download.php
DJV - https://darbyjohnston.github.io/DJV/
.
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...(audio):-
OpenMPT - http://openmpt.org/
Ocenaudio - http://www.ocenaudio.com/
DarkWave - https://www.experimentalscene.com/downloads/
OmniMIDI - https://github.com/KeppySoftware/OmniMIDI/releases
Midi Editor - http://midieditor.sourceforge.net/
VirtualMIDISynth - https://coolsoft.altervista.org/en/virtualmidisynth
Pazera Extrator - https://pazera-software.com/products/audio-extractor/
Nutty Audio Sampler - https://www.nutty.ca/?p=180
Paul's Stretch - http://hypermammut.sourceforge.net/paulstretch/
Sonic Visualiser - https://www.sonicvisualiser.org/
Psycle - https://sourceforge.net/projects/psycle/files/
Wave Editor - http://www.wave-editor.com/
Wavosaur - https://www.wavosaur.com/
LabChirp - http://labbed.net/software/labchirp/
Balabolka - http://balabolka.site/balabolka.htm
DSpeech - http://dimio.altervista.org/eng/
Sekaiju - https://openmidiproject.osdn.jp/Sekaiju_en.html
Sazanami - https://codecpack.co/download/Sazanami.html
Audacity - https://www.audacityteam.org/
Musagi - http://www.drpetter.se/project_musagi.html
MadTracker - http://www.madtracker.org/download.php
XMedia Recode - https://www.xmedia-recode.de/en/download.php
Musescore - https://musescore.org/en/download
WaveShop - http://waveshop.sourceforge.net/index.html
AutoDrum - http://openmidiproject.osdn.jp/AutoDrum_en.html
Giada - https://www.giadamusic.com/download
Fre:ac - https://freac.org/
Anvil - http://www.anvilstudio.com/
Ardour - https://ardour.org/
LMMS - https://lmms.io/
ISSE - http://isse.sourceforge.net/download.html
rFXGen - https://raylibtech.itch.io/rfxgen
Praat - https://www.fon.hum.uva.nl/praat/download_win.html
Spek - http://spek.cc/
Bfxr - https://www.bfxr.net/
SoX - http://sox.sourceforge.net/
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_

...(misc):-
LibreOffice - https://www.libreoffice.org/
AutoHotkey - https://www.autohotkey.com/
Notepad++ - http://sourceforge.net/projects/notepad-plus/
ConTEXT - http://www.contexteditor.org/downloads/
Beeftext - https://beeftext.org
TinyTask - https://www.tinytask.net/
Ditto - https://ditto-cp.sourceforge.io/
Clavier+ - http://utilfr42.free.fr/util/Clavier.php?sLang=en
NeatMouse - https://neatdecisions.com/products/neatmouse/
X-Mouse - https://www.highrez.co.uk/downloads/XMouseButtonControl.htm
GrepWin - https://tools.stefankueng.com/grepWin.html
WinMerge - https://winmerge.org/
dupeGuru - https://dupeguru.voltaicideas.net/
AntiDupl - https://ermig1979.github.io/AntiDupl/english/index.html?page=download.html
Anti-Twin - http://www.joerg-rosenthal.com/en/antitwin/download.html
Diffinity - https://truehumandesign.se/s_diffinity.php
Lucidity - http://skwire.dcmembers.com/fp/?page=lucidity
Sandboxie-Plus - https://github.com/sandboxie-plus/Sandboxie/releases
Perfect Automation - https://www.perfectautomation.com/
Clipboard Master - https://www.clipboardmaster.com/
QuickTextPaste - http://www.softwareok.com/?Download=QuickTextPaste
Peek Through - http://www.lukepaynesoftware.com/projects/peek-through/
WindowsPager - http://windowspager.sourceforge.net/
WindowResizer - https://github.com/caoyue/WindowResizer/releases
MinimizeToTray - https://github.com/sandwichdoge/MinimizeToTray/releases/
Text Editor Pro - https://texteditor.pro/
Pulover’s Macro Creator - https://www.macrocreator.com/download/
HotKey Resolution Changer - https://funk.eu/hrc/
VirtualDesktopSwitcher - https://github.com/hangacs/VirtualDesktopSwitcher/releases
SmartSystemMenu - https://github.com/AlexanderPro/SmartSystemMenu/releases/
LeoMoon HotKeyz - https://leomoon.com/downloads/desktop-apps/leomoon-hotkeyz/
Vovsoft OCR Reader - https://vovsoft.com/software/ocr-reader/
OpenSaveFilesView - https://www.nirsoft.net/utils/open_save_files_view.html
Rename Master - https://joejoesoft.com/vcms/108/
ScreenWatermark - https://sourceforge.net/projects/screenwatermark/
FocusOn Renamer - https://www.pintosoft.com/en/foren
Rainmeter - https://www.rainmeter.net/
Lintalist - https://lintalist.github.io/
Kate Editor - https://kate-editor.org/
StrokesPlus - https://www.strokesplus.net/
SharpKeys - https://www.randyrants.com/category/sharpkeys/
DragLock - https://www.dcmembers.com/skrommel/download/draglock/
RBTray - https://github.com/benbuck/rbtray/releases/tag/v4.11
Carnac - https://github.com/bfritscher/carnac/releases
ZoomIt - https://docs.microsoft.com/en-us/sysinternals/downloads/zoomit
TextDiff - http://www.angusj.com/delphi/textdiff.html
ScreenGridy - https://www.digola.com/screengridy.html
MouseTray - https://github.com/EsportToys/MouseTray
TPMouse - https://github.com/EsportToys/TPMouse
MaxAutoClicker - https://sourceforge.net/projects/maxautoclicker/
Lock Cursor Tools - https://www.digola.com/lockcursor.html
TheFolderSpy - http://venussoftcorporation.blogspot.com/2010/05/thefolderspy.html
PixelNotifier - https://www.dcmembers.com/skrommel/download/pixelnotifier/
OnTopReplica - https://github.com/LorenzCK/OnTopReplica
QTTabBar - http://qttabbar.wikidot.com/
AstroGrep - https://astrogrep.sourceforge.net/download/
Textadept - https://orbitalquark.github.io/textadept/
NormCap - https://dynobo.github.io/normcap/
SetMate - https://www.digola.com/setmate.html
WildGen - https://www.skytopia.com/software/wildgem/index.htm
AnyTXT - https://anytxt.net/
Swiss File Knife - https://sourceforge.net/projects/swissfileknife/
TextWedge - https://sourceforge.net/projects/textwedge/
Coreutils - https://www.gnu.org/software/coreutils/
AutoText - https://sourceforge.net/projects/autotext/
Datamash - http://download.savannah.gnu.org/releases/datamash/windows-binaries/
Diffuse - https://sourceforge.net/projects/diffuse/
CSVfix - https://sourceforge.net/projects/csvfix/
Miller - https://github.com/johnkerl/miller/releases
Ksnip - https://github.com/ksnip/ksnip
GrSync - http://www.opbyte.it/grsync/
AltDrag - https://github.com/stefansundin/altdrag/releases
AltSnap - https://github.com/RamonUnch/AltSnap/releases
ppInk - https://github.com/pubpub-zz/ppInk/releases
XMLstarlet - https://xmlstar.sourceforge.net/download.php
XMLtools - https://github.com/fabiobento512/XmlTools/releases/tag/20d
XMLtool - https://github.com/richardlehane/xmltool/releases
CSV2HTML - https://github.com/dbohdan/csv2html/releases
CSVTK - https://github.com/shenwei356/csvtk/releases
Vim - https://www.vim.org/download.php
SD - https://github.com/chmln/sd/releases
SED - https://gnuwin32.sourceforge.net/packages/sed.htm
GREP - https://gnuwin32.sourceforge.net/packages/grep.htm
UGREP - https://github.com/Genivia/ugrep/releases
AGREP - https://www.tgries.de/agrep/
RIPGREP - https://github.com/BurntSushi/ripgrep/releases
GOAGREP - https://github.com/schollz/goagrep/releases
PCRE2GREP - https://www.pcre.org/current/doc/html/pcre2grep.html
RXREPL - https://sites.google.com/site/regexreplace/
FART - https://fart-it.sourceforge.net/
FNR - http://findandreplace.io/download
FZF - https://github.com/junegunn/fzf/releases
XSV - https://github.com/BurntSushi/xsv/releases
CSVQ - https://github.com/mithrandie/csvq/releases/tag/v1.17.11
MDLT - https://github.com/metadelta/mdlt/releases

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...(resources):-
(* if you plan to outsource, always check the licenses and document everything you use...)
...(materials):-
https://www.textures.com
https://c4dcenter.com/material-library/
http://freepbr.com
https://3dtextures.me
https://www.cc0textures.com/
https://texturehaven.com/textures
https://www.sharetextures.com/textures
https://www.cgbookcase.com/textures
https://publicdomaintextures.com/
https://textures.pixel-furnace.com
http://www.goodtextures.com
https://cgivault.com/product-category/textures/
https://store.chocofur.com/search/free/materials
https://3d-wolf.com/products/materials
https://www.archinspirations.com/materials
https://www.mrmaterials.com
http://patternpanda.org
https://texturebox.com
https://texturefun.com
https://www.texturecan.com
https://matlib.gpuopen.com/main/materials/all
https://hammer3d.com/textures/ (???404???)
https://virtualshade.tumblr.com/ (???404???)
http://cinema4dmaterials.com/category/materials (???404???)
...
...(textures):-
http://texturer.com
http://www.texturemax.com/news
http://texturelib.com
http://www.imageafter.com
https://www.textureking.com/
https://texture.ninja/
https://freestocktextures.com/texture/
https://www.3dxo.com/textures
http://www.3dvalley.com/textures
http://www.humus.name/index.php?page=Textures
https://www.wildtextures.com/category/free-textures/
https://3djungle.net/textures/
http://14textures.com
http://seamless-pixels.blogspot.com
http://www.benkyoustudio.com/Textures/
https://lostandtaken.com/
http://textures101.com
http://texturify.com
http://www.texturise.club
https://mediamilitia.com/category/freebies/
http://www.maxtextures.com/
https://archivetextures.net / https://archibase.co/textures / http://www.cadhatch.com/seamless-textures
http://www.lughertexture.com (???$$$???)
http://www.plaintextures.com (???$$$???)
https://www.highqualitytextures.com/textures (???$$$???)
http://texturez.com (???404???)
http://www.texturegen.com/free-textures (???404???)
http://www.texturemate.com (???404???)
http://www.allcgtextures.com (???404???)
http://www.magnet-textures.com (???404???)
http://www.terminal26.de/d_free_textures.php (???404???)
http://uvtextures.com/ (???404???)

...
...(photographs):-
https://pixabay.com
https://pxhere.com
https://www.pxfuel.com
https://www.reshot.com
https://unsplash.com
https://www.freeimages.com
...
...(marketplaces/communities):-
http://opengameart.org/latest
http://www.blendswap.com/blends
https://share.allegorithmic.com
https://www.vray-materials.de/all_materials.php
http://www.sketchuptextureclub.com/textures
https://www.highend3d.com/downloads
...
...(premium/etc.):- (...may still have free content)
http://www.gamedevmarket.net (~$)
http://3dexport.com (~$)
http://www.arroway-textures.com ($)
https://friendlyshade.com/shop ($)
https://free3d.com ($)
https://www.renderhub.com ($)
https://www.cgtrader.com ($)
https://pbrtexture.com ($)
https://www.lotpixel.com ($)
http://www.turbosquid.com (~$) (*be very careful to check seller's reputation, because TurboSquid will not help you if you get ripped off!) ( https://opengameart.org/forumtopic/turbosquid-merrily-helping-to-sell-stolen-content-again )
...
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