| TopMAD Software | Publisher | |
| TopWare | DeveloperPublisher | |
| TopWare Interactive | DeveloperPublisher | |
| TopazMacaroon | Developer | |
| TopazPlayz | Developer | |
| TophWells | Developer | |
| Topheavy Studios | Developer | |
| Topia | Publisher | |
| TopinambourMan | Developer | |
| Topis | Publisher | |
| Toplitz Productions | DeveloperPublisher | |
| Topo Soft | DeveloperPublisher | |
| Topologika | DeveloperPublisher | |
| Toppan | DeveloperPublisher | |
| Topsoft | DeveloperPublisher | |
| Topstitch Games | DeveloperPublisher | |
| Torben | Developer | |
| Torched Hill | Developer | |
| Torec Studio | Developer | |
| Toremneon | Developer | |
| Toren K. Smith | Developer | |
| Torfi | Developer | |
| Tori | Developer | |
| Tori Truslow | Developer | |
| ToriDomi | Developer | |
| Toridashime Itoi | Developer | |
| Torii Games | Developer | |
| Toriously | Developer | |
| Torito Games | Developer | |
| Torn Banner Studios | Developer | |
| Torn Page | Developer | |
| TornApart | Developer | |
| Tornado | Developer | |
| Tornado Studios | Developer | |
| Tornado Tower | Developer | |
| Toro Comics | Developer | |
| Toroll | Developer | |
| Torpex Games | Developer | |
| TorpleDook | Developer | |
| Torpor | Developer | |
| Torque Studios | Developer | |
| Torreng Labs | Developer | |
| Tortty | Developer | |
| Tortue | Developer | |
| Tortuga Team | Developer | |
| Torus (Philip Mochan, Ricardo J.M. Pinto, Dominic M.N. Prior, Mark Wighton) | Developer | |
| Torus Games | DeveloperPublisher | |
| Torvelt | Developer | |
| Toryn | Developer | |
| Tose | Developer | |