GNU

The GNU Project of the FSF (Free Software Foundation).

Cygwin

Quoting from their website, "Cygwin is a Linux-like environment for Windows".

SVN

Quoting from their website, "The goal of the Subversion project is to build a version control system that is a compelling replacement for CVS in the open source community."

OMG (Object Management Group)

Home of the UML and OCL standards.

Klasse Objecten

Home of Octopus, an Eclipse plug-in for OCL 2.0, and Jos Warmer and Anneke Kleppe, the lead authors of OCL.