Minetest
Description: Minetest is an open source voxel game engine. It is similar to Minecraft and allows players to explore procedurally generated 3D worlds and build anything they can imagine using blocks.
Type: software
Pricing: Open Source
Pokemon Showdown
Description: Pokemon Showdown is a browser-based Pokemon battle simulator and Pokémon gaming community. Players can create a team of Pokémon and battle against other players in a variety of tiers and metagames.
Type: software