Transparent Textures https://www.transparenttextures.com/
Lost and Taken https://lostandtaken.com/
TextureMate https://web.archive.org/web/20160302205056/http://www.texturemate.com/
TextureTown https://textures.neocities.org/
Texturelabs https://texturelabs.org/
TexturesForFree https://texturesforfree.com/
PNGWing https://www.pngwing.com/
PNGEgg https://www.pngegg.com/en
Anyrgb https://www.anyrgb.com/
PNGAll https://www.pngall.com/
FreePNGimg https://freepngimg.com/