Hi, the GS AP plugin is here: https://git.gnu.io/dansup/ActivityPub/tree/dev but it isn't ready to be used yet. You can follow the progress on the issue board: https://git.gnu.io/dansup/ActivityPub/boards
@donblanco ActivityPub and OStatus are different protocols for the same thing - the idea is that the whole fediverse starts using ActivityPub as it is lighter and simpler to implement, it also makes easier Client to Server communication