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OpenSimulator ActivityPub Bridge - A lightweight, database-driven ActivityPub implementation designed for OpenSimulator grids, with first-class support for system actors, groups, and federated posting without requiring OpenSim C# modules, sidecars, or viewer changes.

This project focuses on simplicity, deployability, and compatibility with existing OpenSim + MariaDB setups. (should also work with MySQL if you run the oracle software)

Tested with Forte v26.2.4, Streams v26.2.10, Hubzilla v11.0 (but should work with any AP capable software like Mastodon, Lemmy, etc)

It will verify RFC 9421 sigs if used by remote, but this software only signs with Cavage / V1 signatures.

At this stage it posts group notifications to the social web. It has the capability to inbox/outbox messages for grid users however not yet implemented until I decide on a intuitive way to do it.

https://codeberg.org/fionasweet/OS-AP