Tool · Out now MarchingBlocks Sculpt one block. Paint a world. 100% · Version 1.1.0 — free and open source (GPL-3.0)
Tool · Out now MarchingSquares Paint one guide. Get a complete 2D tileset of plateaus and cliffs. 80% · Version 1.0.0 — free and open source (CC0); next, a hand-painted example tileset