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LyX - Graphical document editor frontend for LaTeX. See 2.0 review.
Ableton Live - Innovative music creation software developed in Berlin.
Netbeans - I pioneered using this IDE for Java in 1998 and even visited them at location in Prague.
Askozia PBX - Simple embedded telephony solution
I use this - Famous peoples desktop setups.
yEd - Better that Visio and free. Also check out Graphwiz CLI tool.
pandoc - “a universal document converter”. Also see how can be combined with pandoc, Easy LaTeX with Markdown and Pandoc
bedrock - fast, reliable and clustered database based on sqlite
This is Colossal - A blog of Art and Visual Ingenuity
THE RECODE PROJECT - An active archive of computer art