[daveoflynn]

Many of the products were acquisitions, though often at a very early stage in the product's lifecycle. Off the top of my head, acquisitions: HipChat, Bitbucket, GreenHopper (now JIRA Agile), SourceTree, FishEye, Crucible, Clover, Crowd, Bamboo.

[tomjadams]

Cenqua is the company that had fishey, crucible & clover. About 5 people when they bought it, and probably their first acquisition.