Give credit. Keep source.
New website code is GPL-2.0-or-later. Individual engines and game data retain their own licenses. The table describes the projects in our catalog; a directory listing does not imply that we distribute that engine or its assets.
| Game / project | Engine | Assets |
|---|---|---|
| Open Cadet | MIT | CC0-1.0 |
| OpenTTD | GPL-2.0-only | OpenGFX/OpenMSX: GPL-2.0; OpenSFX: CC-BY-SA-3.0 |
| Freedoom | GPL-2.0-or-later (engine) | BSD-3-Clause (Freedoom) |
| OpenTyrian | GPL-2.0-or-later | Tyrian 2.1 freeware; original assets retain their license |
| Beneath a Steel Sky | GPL-3.0-or-later | Revolution Software freeware license |
| Lure of the Temptress | GPL-3.0-or-later | Revolution Software freeware license |
| Flight of the Amazon Queen | GPL-3.0-or-later | Flight of the Amazon Queen freeware license |
| Sołtys | GPL-3.0-or-later | L.K. Avalon freeware license |
| Doom | GPL-2.0-or-later | Original game data required |
| Quake | GPL-2.0-or-later | Original game data required |
| Drascula: The Vampire Strikes Back | GPL-3.0-or-later | Alcachofa Soft freeware license |
| DreamWeb | GPL-3.0-or-later | DreamWeb freeware release |
| Sfinx | GPL-3.0-or-later | L.K. Avalon freeware license |
| The Griffon Legend | GPL-3.0-or-later | Freeware release; see distribution terms |
| Tomb Raider | BSD-2-Clause | Original game data required |
| Duke Nukem II | GPL-2.0-or-later | Original game data or separately licensed shareware required |
| RollerCoaster Tycoon 2 | GPL-3.0-or-later | Original game data required |
| Jazz Jackrabbit | GPL-2.0-or-later | Original game data required |
| Super Mario 64 | CC0-1.0 | Original ROM required |
| The Legend of Zelda: Ocarina of Time | See upstream component licenses | Supported original ROM required |
| The Legend of Zelda: Majora’s Mask | CC0-1.0 and dependency licenses | Supported original ROM required |
| Star Fox 64 | CC0-1.0 and dependency licenses | Supported original ROM required |
| Perfect Dark | MIT and dependency licenses | Supported original ROM required |
| Sonic the Hedgehog | Source-available: noncommercial RSDK license | Official release assets required |
| Sonic the Hedgehog 2 | Source-available: noncommercial RSDK license | Official release assets required |
| Sonic CD | Source-available: noncommercial RSDK license | Official release assets required |
| Sonic Mania | Source-available: see upstream restrictions | Official release assets required |
| Diablo | Source-available: Sustainable Use License | DIABDAT.MPQ required for the full game |
| Dune II | GPL-2.0 | Original game data required |
| Banjo-Kazooie | GPL-3.0 | Supported original ROM required |
Images
Open Cadet uses Andrew Nakas’s CC0 replacement art. OpenTTD screenshots use OpenGFX artwork. Freedoom images show its freely licensed replacement assets. Beneath a Steel Sky retains Revolution Software’s game-art rights. Image provenance is recorded in the source repository.
Engine distributions
Each distributed runtime links to its exact source and build instructions through its manifest. If an attribution or license record is wrong, please report the specific file or entry.