Verein zur Förderung freier Software Österreich
The branche office to the FSF, in Austria.

SWT (Standard Widget Toolkit)
The toolkit we are using for our client GUI.

The GNU Compiler for the Java Programming Language.

Java CVS (from Netbeans)
The CVS Client for Java, we use in Sourcekeeper

Eclipse IDE
The IDE we use for developing Sourcekeeper. In our opinion the best, free IDE for Java.

Blackdown Java VM
Blackdown Java is an implementation of the Java platform on Linux which runs also on SPARC, PowerPC and other architectures.

Kaffe Java VM
Kaffe is a free virtual machine for Java (for Linux).

CVS version control
CVS is a version control system, which is supported by Sourcekeeper.