<sub>Every section listed alphabetically</sub>
## Textures
- [CG Textures](http://www.textures.com) License covers commercial use, but not open source software. \**Registration required, free at low resolutions\**
- [Depthfields](http://depthfields.com) Height maps only, CC-0/Public domain
- [Episcura](http://episcura.com/) \**Registration required\**
- [Good Textures](http://www.goodtextures.com) Similar to CG textures, but with a more lenient license. \**Registration required\**
- [Lovetextures](http://www.lovetextures.com)
- [Mayang's Textures](http://mayang.com/textures)
- [Notextures](http://notextures.com) Paid high resolution versions
- [nordicfx](http://www.nordicfx.net/?works=free-textures) non-commercial
- [OpenGameArt](http://opengameart.org/textures/all) CC-BY
- [PixPlant's Seed Images](http://www.pixplant.com/pixfinder.php) Various licenses
- [Plain Textures](http://www.plaintextures.com) \**Registration required\**
- [Poliigon](https://www.poliigon.com/) Paid registration required for high resolution versions
- [Subtle Patterns](http://subtlepatterns.com)
- [Textures.TheFree3DModels](http://textures.thefree3dmodels.com) Attribution required Noncommercial
- [Texturebits](http://texturebits.blogspot.com)
- [Texture lib](http://texturelib.com/) free for commercial and none commercial use, license is very lenient
- [Texture Mate](http://www.texturemate.com) 
- [texture pilot](http://www.texturepilot.com) \**Registration required\**
- [Texture X](http://www.texturex.com) Free high resolution textures.
- [3dmd.net](http://www.3dmd.net)  Small library and no high resolution
- [3DTextures](https://3dtextures.me/)
- [Yethiel's Collection of Textures](https://yethiel.wordpress.com/cc0-textures/) Various textures collected by an individual with CC0 license

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## HDR/JPEG Skydome Images

- [Adaptive Samples](http://adaptivesamples.com/category/hdr-panos) CC-BY-SA.
- [GiantCowFilms.com](http://giantcowfilms.com/category/hdrs/) CC-0/Public Domain
- [HDRI Hub](http://www.hdri-hub.com/free-samples) Free Samples.
- [Maxwell render resources](http://resources.maxwellrender.com/news_scripts.php?t=4)
- [MrBluesummers](http://www.mrbluesummers.com/category/downloads/downloads-textures-materials) HDR lights.
- [nordicfx](http://www.nordicfx.net/?works=hdri) non-commercial
- [Open Footage](http://www.openfootage.net/?cat=15) CC-BY.
- [Philo's Sky Collection](http://www.philohome.com/skycollec/skycollec.htm)
- [sIBL hdrlabs](http://www.hdrlabs.com/sibl/archive.html) CC-BY-SA
- [ 0ptikz's skies](http://blenderartists.org/forum/showthread.php?24038-Free-high-res-skymaps-(Massive-07-update!))

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## Stock Photos

- [BucketListly](http://photos.bucketlistly.com/) CC-BY-NC
- [Foter](http://foter.com/) Various CC Licenses
- [FreeImages](http://www.freeimages.com/)
- [Image After](http://imageafter.com/)
- [Immediate Entourage](http://www.immediateentourage.com/) many masked images
- [Library of Congress](http://www.loc.gov/pictures/) Public Domain
- [MorgueFile](http://morguefile.com/)
- [openclipart](https://openclipart.org/)
- [OpenImages](http://www.openimages.eu/media)
- [Pexels](https://www.pexels.com/) CC0
- [Pixabay](http://www.pixabay.com/) CC0
- [Pond5](https://www.pond5.com/free) \**Registration required\**
- [PhotoPin](http://photopin.com/) Various CC Licenses
- [PublicDomainPictures](http://publicdomainpictures.net/) reduced resolution free, Public Domain
- [Stockvault](http://www.stockvault.net/) non-commercial
- [USDA](http://www.ars.usda.gov/News/docs.htm?docid=23559) Public Domain
- [US Navy](http://www.navy.mil/viewGallery.asp) Public Domain
- [Visible earth NASA](http://visibleearth.nasa.gov/) Public Domain
- [3dtotal](http://freetextures.3dtotal.com/index.php) some textures too