Build local-first software
Automerge is a library of data structures for building collaborative applications.
Automerge is a Conflict-Free Replicated Data Type (CRDT), which allows concurrent changes on different devices to be merged automatically without requiring any central server.
Use any connection-oriented network protocol: client-server, peer-to-peer, or local. Or use unidirectional messaging: send an Automerge file as an email attachment or store it on a file server.