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  • Linux - open source operating system

  • Apache - open source web server

  • mySQL - open source SQL data store

  • Perl - most craigslist software is written in Perl (tmtowtdi)

  • Sphinx - open source search engine

  • OpenStreetMap - geographic data for the world

  • Haraka and Postfix -  email servers

  • Redis - open source key-value store

  • MongoDB - open source NoSQL database

  • Git - open source version control

  • GNU - emacs, gcc, bash, the concept of free software

  • Mozilla - Firefox, bugzilla, etc

  • Pine - email client, "it works"

  • Wikipedia - the world's encyclopedia, "we link to thee"

  • EFF - watching over our rights in the electronic world

  • WELL - online community pioneer

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