Deep Night - 8x8 Platformer Assets Tileset (CC0, Free)
Detailed pixel assets at a small size, includes a fully animated player, enemies, etc.
Blocks, Lines, and Shapes - 16x16 Tiles (CC0, Free)
Thousands of tile variations that work for platformers, puzzlers, and more.
Weird Alien Flora and Trippy Textures pack
3D meshes with 15 unique textures