A powerful, cross platform, SQL database system
Firebird RDBMS offers ANSI SQL features & runs on Linux, Windows & several Unix platforms. Features excellent concurrency & performance & powerful stored procedure & trigger language. WEBSITE link is below, TRACKER is http://tracker.firebirdsql.org
This is an easy to use and extensible rules engine written in C# for .NET and Mono.
The Open2Dgel project has moved to the Open2Dprot.sourceforge.net project Web site - a more general project for 2D protein expression data analysis.
PlutoStatus is a system to publish the current status of your systems. It includes mirroring.
Double is just another simple database.