2D
http://unluckystudio.com
http://lpc.opengameart.org/static/lpc-style-guide/assets.html#
http://www.lostgarden.com/search/label/free%20game%20graphics
http://pousse.rapiere.free.fr/tome/
http://www.dumbmanex.com/bynd_freestuff.html
http://untamed.wild-refuge.net/rmxpresources.php?characters
http://www.pioneervalleygames.com/free-resources.html
http://ask4asset.com/tag/freebie/
http://opengameart.org
vector
http://open.commonly.cc/unlocked
http://www.glitchthegame.com/public-domain-game-art/
http://opengameart.org/users/kenney
http://www.gameart2d.com/freebies.html
http://opengameart.org/users/spriteattack
http://opengameart.org/users/nicubunu
http://www.graphic-buffet.com/freebies/
2D and 3D
http://www.supergameasset.com/free-game-assets
http://www.reinerstilesets.de
3D
http://www.mocapdata.com/
http://mocap.cs.cmu.edu/
http://www.turbosquid.com/
http://www.blender-models.com
http://www.blendswap.com/
http://www.katorlegaz.com/3d_models/index.php
https://3dwarehouse.sketchup.com/index.html
http://lodbook.com/models/
http://www.sharecg.com/index.php
http://archive3d.net/
sounds
http://sound-effects.ultragraphicsstudio.com/
http://www.drpetter.se/project_sfxr.html
http://www.flashkit.com/soundfx
Music
http://incompetech.com
http://boxcat.bandcamp.com/
http://freemusicarchive.org
https://www.jamendo.com
http://freepd.com/
http://opengameart.org/art-search-advanced?keys=&field_art_type_tid[]=12
http://open.commonly.cc/unlocked
textures
http://www.cgtextures.com/
http://www.mayang.com/textures/
http://www.imageafter.com/
http://www.texturearchive.com/
http://www.lunaran.com/page.php?id=8
http://opengameart.org/textures/all
http://resources.blogscopia.com/category/textures/
http://opengameart.org/users/yughues
Fonts
http://www.dafont.com/es/
https://www.acidfonts.com/
http://openfontlibrary.org/en
http://opengameart.org/art-search?keys=font
https://www.google.com/fonts/
http://www.urbanfonts.com/
icons
http://game-icons.net/
random names and description generators
http://nine.frenchboys.net/
PAID
2D
http://www.gameartguppy.com
http://www.brashmonkey.com/artpacks.htm
http://kenney.itch.io/kenney-donation
http://graphicsforgames.com/
http://bevouliin.com/
http://www.gameart2d.com/
http://www.graphic-buffet.com/
http://www.content-pack.com/category/products/games/
http://www.pioneervalleygames.com/resource-packs.html
http://graphicriver.net/
textures
http://www.turbosquid.com/
http://www.daz3d.com
http://www.cgtrader.com
http://3drt.com/store/
http://3dmodels-textures.com/
http://www.frogames.net/
http://3docean.net/
2D and 3D
http://www.supergameasset.com
http://www.contentparadise.com
https://www.gamedevmarket.net/
https://www.fiverr.com
3D
http://www.3dfoin.com/
http://www.turbosquid.com/
3D animations
http://www.mocapdata.com/
http://www.truebones.com/store.html
sounds
http://sound-effects.ultragraphicsstudio.com/
https://www.fiverr.com
textures
http://gametextures.com
fonts
http://www.myfonts.com/