Hi there,
is there somewhere a list of extensions used in the wild with #activitypub/#activitystream (ideally linked to the projects using them)?
Thanks
@Goffi not that I am aware of in the sense you are referring to it.
I am co-maintaining the #activitypub developer + protocol apps watchlists at https://git.feneas.org/feneas/fediverse/-/wikis/home
Regarding extensions we are setting up a FEP process:
https://socialhub.activitypub.rocks/t/fep-a4edc7b-the-fediverse-enhancement-proposal-process/1090
https://git.activitypub.dev/ActivityPubDev/Fediverse-Enhancement-Proposals
And I proposed a more non-technical Fediverse Futures initiative to elaborate business domain extensions:
https://socialhub.activitypub.rocks/t/fediverse-futures-visions-dreams-feedback-wanted/1238
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
@humanetech thanks for the feedback and links, it's a good starting point.
Yes I've heard about FEP yesterday as we've add a discussion about it with the #XMPP tag (that I'm following being and XMPP dev). I think it's a really smart move from ActivityPub community, I wish the best to it.