I'm considering adding a "clients" category to https://fedidb.org that will list all known fediverse apps, and a compatibility matrix to be able to compare them.

I started working on a "software comparison" feature that allows you to compare various features of X software, I will probably need the communities help to finish the feature database, I think it has a lot of potential.

This also can be duplicated to list activitypub compatibility between projects, which is super exciting!