Radical Entertainment
Radica
Radience Software
Radio Shack
Rainbird
Rainbow Computing
Rainbow Connection Software
Rake In Grass
Ralston Foods
Rampant Games
Rare Ltd
Raven Software
Razorworks
ReadySoft
Real Arcade
Realism Entertainment
Reality Gap
Reality Pump
Realtime Worlds
Rebellion
Rebelmind
Red Marble Games
Red Octane
Red Panda Games
Red Storm Entertainment
Reflexive Entertainment
Relic Entertainment
Remedy
Renegade Ware
Rennaisance Technology
Renovation
Respawn Entertainment
Retrozone
Rigor Mortis Software
Rino Software
Ripcord
Ritual
Rival Interactive
Riverdeep
Riverman Media
Robomodo
Rock Star Games
Rocksteady
Rogue Entertainment
Roklan Software
Rooster Games
Rubin Microsystems
Ruffian
Runic Games
Running With Scissors
Rusty Axe Games
Note: bolded names indicate companies that released a game within the last twelve months.