WorldEdit - Minecraft MOD - WorldEdit is an easy-to-use in-game Minecraft map editor. Through a combination of commands and "brushes," you can sculpt your world or simply perform numerous terraforming tasks.
Besiege - Besiege is a Physics-based, Single-player Strategy video game created and published by Spiderling Studios.
MCEdit - MCEdit is an open source world editor for the popular game Minecraft.
Mechanic Max: Kids Game - Mechanic Max: Kids Game is an Education Simulation by Bubadu.
WorldGuard - Minecraft Plugin - WorldGuard is a powerful plugin with a large bag of tricks for server owners, server map makers, regular survival servers, and everyone in between!
Brick Rigs - Brick Rigs is a Physic-based, Crafting, Single and Online Multiplayer Simulation developed and published by Lukas Rustemeyer.