Kaedim - Use the Kaedim Platform to automatically transform your 2D art, sketches and photos in 3D.
Amulet Map Editor - The Amulet Map Editor is a new and innovative Minecraft map editor made by the Amulet Team, a team formed by the contributors that brought you MCEdit-Unified
Spline - Design tool for 3d web experiences
Wurst - Minecraft open source hack
Vectary - Vectary is a free, online 3D modeling tool and sharing platform.
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!