remoteStorage is ‘an open protocol for per-user storage on the Web’

remoteStorage is the first open protocol to enable truly unhosted web apps.

The website has a section about Unhosted web apps.

See decentralized web

References

https://www.inkandswitch.com/local-first.html

https://jaredforsyth.com/posts/local-first-database-remotestorage/

https://remotestorage.io/