Every section listed alphabetically
Textures
- CG Textures License covers commercial use, but not open source software. *Registration required, free at low resolutions*
- Depthfields Height maps only, CC-0/Public domain
- Episcura *Registration required* [Site appears to be inactive as of 1 March, 2017.]
- Good Textures Similar to CG textures, but with a more lenient license. *Registration required*
- Lovetextures
- Mayang's Textures
- Notextures Paid high resolution versions
- nordicfx non-commercial
- OpenGameArt CC-BY
- PixPlant's Seed Images Various licenses
- Plain Textures *Registration required*
- Poliigon Paid registration required for high resolution versions
- Subtle Patterns
- Textures.TheFree3DModels Attribution required Noncommercial
- Texturebits
- Texture lib free for commercial and none commercial use, license is very lenient
- Texture Mate
- texture pilot *Registration required*
- Texture X Free high resolution textures.
- 3dmd.net Small library and no high resolution
- 3DTextures
- Yethiel's Collection of Textures Various textures collected by an individual with CC0 license
HDR/JPEG Skydome Images
- Adaptive Samples CC-BY-SA.
- GiantCowFilms.com CC-0/Public Domain
- HDRI Hub Free Samples.
- Maxwell render resources
- MrBluesummers HDR lights.
- nordicfx non-commercial
- Open Footage CC-BY.
- Philo's Sky Collection
- sIBL hdrlabs CC-BY-SA
- 0ptikz's skies
Stock Photos
- BucketListly CC-BY-NC
- Foter Various CC Licenses
- FreeImages
- Image After
- Immediate Entourage many masked images
- Library of Congress Public Domain
- MorgueFile
- openclipart
- OpenImages
- Pexels CC0
- Pixabay CC0
- Pond5 *Registration required*
- PhotoPin Various CC Licenses
- PublicDomainPictures reduced resolution free, Public Domain
- Stockvault non-commercial
- [Rawpixel] (https://www.rawpixel.com/) free for commercial
- Unsplash CC0
- USDA Public Domain
- US Navy Public Domain
- Visible earth NASA Public Domain
- 3dtotal some textures too
