Archipelago
Archipelago Multi-Game Randomizer and Server
...When a player finds an item belonging to someone else, the system automatically sends that item to the correct player through a networked server. This design encourages cooperative gameplay because progress in one player’s game can depend on items found by other participants. Archipelago includes tools for generating randomized game worlds, hosting multiplayer sessions, and connecting players through dedicated clients. The framework supports a growing list of games that have been adapted to work with its randomization protocol.