Unity - The multiplatform game creation tools for everyone.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Struckd - 3D Game Creator - Struckd is the next-generation gaming platform for user created content where people of all ages...
Reality Factory - Reality Factory is a free suite of game development tools for building 3D games.
Adventure Game Studio - Adventure Game Studio provides the tools to make your own adventure, for free!
CraftStudio - CraftStudio lets you craft games from scratch in real-time over the Internet.