Best Open Source Software

This is a BOSS thread, let's see what turns out to be our favorite open source software. For me, it's definitely GIMP, the gnu image manipulation software. You can get it at http://www.gimp.org/

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Uriel - JEW
Joe DiMaggio - JEW
Thin Lizzie - JEW
Joel Onsoftware - JEW
Ferdinand Porsche - JEW
Matt Groening - JEW
Charles Dickens - JEW
Bill Cosby - JEW