Parallax Software. A company who only exists in name alone and was, essentially, a one-hit wonder. Was it a bad one-hit?
Short answer is definitely not.
Descent and Descent 2 (as well as some expansions, I will talk about those later) ended up reorganizing Parallax into two companies. Why? Well, after Descent 2, half of the team wanted to go work on other things, such as Freespace, and later on Red Faction and Saints Row, so they renamed Parallax to Volition, and Outrage left to work on Descent 3. Outrage Entertainment ended up working on Descent3 and its expansion, D3: Mercenary. They also did a game called Alter Echo which nobody's ever played but it got reviews harbored at around 68/100, then by disappearing.
That is, until they banded together with Volition (perhaps it was Volition's own doing) as the Parallax Software name still existed legally and Interplay took the money they were making from Descent, and ran with it instead of paying their royalties.
Now, with that all...