Reality Factory - Reality Factory is a free suite of game development tools for building 3D games.
Construct Classic - Construct Classic is a free, DirectX 9 game creator for Windows, designed for 2D games.
CraftStudio - CraftStudio lets you craft games from scratch in real-time over the Internet.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Limon Engine - Limon is a multi platform 3D game engine mainly focusing on first person games.
RPGBoss - Cross-platform 2D role playing game maker.