Environment tiles and objects with a top-down perspective. The licence is CC-BY 4.0.
Many environment and item sprites, plus a few creatures. The licence is CC-BY-SA.
Tiles, creatures, and icons in a low-detail style—essentially 1-bit with added colour, if that makes sense…. The licence is CC-BY 4.0.
Extensive set of top-down tiles, objects, enemies, and a player character. The grid size is 16×16 pixels, and the licence is a typical “use however you like, but don’t resell” one.
8×8 creature sprites themed for different environments, plus a ground block for each. The licence is CC-BY 4.0.
Environments, objects, friends and foes. The licence is CC0.
Platformer environment tiles, items, enemies, and a player character. Comes in a free version and a much-expanded paid version. The licence is a typical “use however you like, but don’t resell” one.
Medieval fantasy items. Each is a single PICO-8 sprite (8×8 pixels), and the quality is fantastic. The licence is CC0.