Blazing Games
Makes online distraction games. Many are open source.
Blue Castle Games
Made the BIGS baseball game and MLB Front Office Manager.
Clicktoy Interactive
Safe games for toddlers, makers of the Meadow.
Condition30
Runs Supergroup, an interactive music game. Also makes ZenStrings which generates videogame music based on a proprietary algorithm.
Deep Fried Entertainment
Makers of baseball games MLB Superstars and Fantasy All-Stars.
Electronic Arts Canada
Canadian base of the Sims maker.
Hellbent Games
Developed Lego Battles for Warner Brothers Interactive.
Hothead Games
Developed Penny Arcade episodic game, Swarm, and Deathspank. Yes, Deathspank.
Jarhead Games
Makers of military games like Marine Sharpshooter and Navy SEALs.
Jet Black Games
Nintendo DS and Wii game maker. Titles include Baby Pals, Dancing with the Stars, and Popeye Boxing.
Jolly Bear Games
Downloadable puzzle and simulation games, free for an hour of play before purchase.
Kerberos Productions
Makes the Sword of the Stars series of strategy games.
Klei Entertainment
Makes online games like Eets and Sugar Rush.