You can just combine different software to have it work as you like. - KeepassXC as password manager - Syncthing to synchronize your db (no server is required

You can just combine different software to have it work as you like. - KeepassXC as password manager - Syncthing to synchronize your db (no server is required on your part) In general security software should be stable. I'm not sure why updates are needed other than for vulnerabilities (which should be exceedingly rare). The security is guaranteed as long as the software performs up to spec (the crypto implementation being free of errors)