Caffeine is a free high-performance interoperability solution between the Java platform and the .NET framework, with special emphasis on the enterprise variants of such platforms. It makes software originally written for .NET available to the Java platform. It promotes library reuse between Java and .NET by transferring APIs across environments, and allows code written for one platform to run on the other platform with minimal performance degradation. It is powered by Mono, and runs on Alpha, Linux, Windows, Mac OS X, HPPA, SPARC, and s390 systems.
DuhDraw is a program which almost perfectly simulates TheDraw for DOS. Back in the good old BBSing days, TheDraw was a program used by a SysOp in order to draw ANSI screens, the only graphics available on BBSes for quite a while. However, for a long time, nobody considered Linux, as Linux BBSes were uncommon. Other applications of the software include login screens, and mud screens. I always thought it ironic that MUDs were mostly run off of Unix machines, and yet they used DOS editors to generate the ANSI screens.
Libtrading is a C library for trading securities, foreign exchange, and financial derivatives electronically. It implements market data, order entry, drop copy, and related communications protocols used by exchanges and alternative trading venues across the world. The library is designed for high performance and robustness. Although latency is very important in trading today's markets, achieving it it must not jeopardize trading reliability.