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
Open Cobalt
Description: Open Cobalt is an open source virtual world browser and 3D application platform. It allows users to create virtual 3D worlds and interact with them in real-time.
Type: software
Pricing: Open Source