There are a couple share project listed on https://delightful.club/delightful-activitypub-development/
Thank you. Well, not so much on this topic speciically. I would advise to create a bit more elaborate call-for-help with some more background info, cross-post it to other relevant Lemmy communities, boost it on the Fediverse. And likely good to create a separate fedi (pleroma/mastodon/ etc.) toot with a bunch of hashtags in it and a link to the Lemmy post. Hashtags like: #art #artwork #graphics #design #UX
Yes, true. I asked the question in a more general sense on the fedi: https://mastodon.social/@humanetech/107540889998564900
The question is whether the project should be forked into multiple separate projects at all. An alternative would be to have a generic "Directory Platform" and have modules to make it a Book Review platform, a Movie Database, or whatever-you-wanna-collect platform with another module. The modules would mostly be templates and data structures + user interface widgets to present them nicely.
SocialHub has an association with the W3C Social Web Incubator Community Group (SWICG). The SWICG is a continuation of the Working Group that standardized ActivityPub as a W3C Recommendation. So technically this organization exists.
In practice it is really hard to organize in an all-volunteer grassroots movement, and many people for various reasons don't like to participate in such organization. "Herding cats" is a term that is used. Being grassroots has pros (resilience) and cons (stalled evolution). Personally I have come to think that decentralized development of the Fediverse probably works best when it is split into different domains (e.g. Microblogging, Podcasting, etc.) as long as there's also a community working on the core common denominator in the protocol. That is currently the SocialHub and Fediverse Enhancement Proposal process.