open.mp (Open Multiplayer, OMP) is a substitute multiplayer mod for San Andreas, initiated in response to the unfortunate increase in problems with updates and management of SA:MP. The initial release will be a drop-in replacement for the server only. Existing SA:MP clients will be able to connect to this server. In the future, a new open.mp client will become available, allowing more interesting updates to be released.
SA-MP Forum copy
Since 2020 the official SA-MP forum is offline. The guys from blast.hk have quickly provided a copy of the forum, with which a large part of the forum posts are still available. The forum cannot be actively used, but at least the postings are still available.