Tartarus is…

• The Void in the Underworld; the lowest region of the world
• A place of punishment for sinners; the opposite of Elysium
• The father of the monster Typhon who lies under Mount Aetna
• The online home of a disparate group of free software programmers and their projects

... but mainly it's just a name that I liked. (Mythology references from Encyclopedia Mythica.)

You might like to find out about the people who make up Tartarus.