Can I add Synapse? While more of a publisher rather than a developer, You knew Synapse games had that 'oddball but awesome' feel to their games. And I loved the opening fanfare to their early games. I can still blow through Shamus Case 2 inside a half-hour.

I'm also gonna add Access from the C64 Pantheon; Beach Head, Raid Over Moscow, Neutral Zone.... loved Access games.