Funny thing about Dynamix...
They made a few games... two which I find noteworthy:
Earthsiege2 (mayb ES1, but I never have seen or played that)
Starsiege: Tribes
Both were released under Sierra, though sierra didn't actually develope the games in the slightest.
After Tribes, I think Sierra just plain out purchased Dynamix... which is too bad, because the Terrain and level style that Dynamix had established with Earthsiege2 certainly kicked ass and it's kick assness was extended in the world of Tribes.
Peace! :-p