BYOND - BYOND is the premier community for making and playing online multiplayer games.
Grasshopper 3D - Grasshopper™ is a graphical algorithm editor tightly integrated with Rhino’s 3-D modeling tools.
Defold Engine - Defold lets you quickly build high performing, cross-platform games together with your team.
DYNAMO BIM - An open-source platform for computational design and for building information modeling (BIM).
ct.js - ct.js is a 2D game editor (desktop app) based on web technologies.
Houdini - Houdini covers all the major areas of 3D production, including: