The Irrlicht Engine is an open source high performance realtime 3D engine written and usable in C++. It is completely cross-platform, using D3D, OpenGL and its own software renderers.
CoolReader is fast and small cross-platform XML/CSS based eBook reader for desktops and handheld devices. Supported formats: FB2, TXT, RTF, DOC, TCR, HTML, EPUB, CHM, PDB, MOBI. Platforms: Win32, Linux, Android. Ported on some eInk based devices.
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Robot Controlling System (RCS) - is a .NET-oriented software group for controlling remote mechanical objects, debuging and programming them by .NET-languages
Java Tiny Gfx Library (JTGL) is a graphic fundation framework (a graphics/gaming api) that will allow easy deployment/porting of applications/games on many environments: J2SE,J2ME/MIDP(Nokia,Siemens,BlackBerry),SuperWaba(Palm,PPC,Symbian),ExEn,DoJa,etc..