XMAMan 

Rigidbody physics engine. Used sourcecode is https://github.com/XMAMan/RigidBodyPhysics/commit/cfa82bc153a5d02bbf134a30dfc8d2d4090a30fa

extends the physic engine with graphic output Used sourcecode is https://github.com/XMAMan/RigidBodyPhysics/commit/f0b97c091f324cf91dce92a5b227eced5e6e5717

Graphic engine for 2D and 3D. Used sourcecode is https://github.com/XMAMan/GraphicEngine8/commit/5fae94f3c9c6913ebd9c713b0776999a41079130

Sound engine for synthesizer sounds. Used sourcecode is https://github.com/XMAMan/SoundEngine/commit/67473ebdf6c9e2dfb45cbacc31c5f83163fffbd7

Graphic engine for 2D Used sourcecode is https://github.com/XMAMan/GraphicEngine8/commit/5fae94f3c9c6913ebd9c713b0776999a41079130