Recursive acronyms

Anybody with a non-trivial interest in computer science must be familiar with recursive acronyms: acronym whose expansion contains the abbreviation itself. Most famous of them is probably GNU: GNU's Not Unix.
Some other interesting and famous ones:

• CYGNUS: Cygnus, Your GNU Support
• LAME: Lame Ain't an MP3 Encoder
• PNG: PNG's Not GIF
• WINE: Wine's Not an Emulator

Thanks to Wikipedia for this list.
But one that beats them all is XINU: Xinu Is Not Unix. It is not only a recursive acronym, but also an anagram!