Kambi VRML game engine is a free/open-source 3D (game) engine. The engine is written in clean Object Pascal code, and we have an excellent support for the VRML / X3D 3D data (although other 3D model formats are also supported).

Box2D is a 2D rigid body simulation library for games. Programmers can use it in their games to make objects move in believable ways and make the game world more interactive. From the game's point of view a physics engine is just a system for procedural animation. Box2D is written in portable C++. Most of the types defined in the engine begin with the b2 prefix. Hopefully this is sufficient to avoid name clashing with your game engine.

Novelty is a free game maker tailored for making visual novels. Contrary to most other visual novel makers, Novelty is designed for people without any experience in scripting or programming.

Andorra 2D features a simple API for 2D programming which offers you the choice between both: The power of DirectX and OpenGL without the need of knowing anything about those graphic interfaces. Andorra 2D is designed to be the successor of DelphiX. That is because Andorra 2D uses nearly the same sprite engine interface as DelphiX.