Apps Related to 3D Buildings

Minetest is a free and open-source voxel game engine, similar to Minecraft. It allows users to build various structures, explore vast, procedurally generated worlds, and engage in survival-based gameplay or creative construction. Its strong emphasis on modding and community contributions provides a highly customizable and extendable experience.

OpenStreetMap (OSM) is a global, collaborative project to create a free, editable map of the world. It's built upon data contributed by millions of volunteers, offering a highly detailed and up-to-date alternative to commercial mapping services.