Search keywords: Yjs, P2P
Another way to look for candidates: search for the ones that use Yjs, and maybe specifically y-webrtc, or other P2P-related libs like Automerge. Such apps, given that they’re purely P2P and it’s not just a small part of them, can easily be adapted to webxdc with the webxdc-yjs-provider library.
Moreover, there’s probably no need to fork such apps to port them (see my post about forks).