The primary feature that I'm implementing p2p synchronization (similar to syncthing, although the prototype use tailscale); append-only storage for easy backup and an "api" for easy integration/synchronization with external sources like RSS feed for example, all working offline.
Right now I'm using various software to manage my digital life (Zotero, Keepass, Syncthing) but i want to consolidate since I'm having trouble keeping all properly synced and backed)