Passman is described as 'Open Source Password Manager.
Passman allows you to host your passwords and credentials on your own Nextcloud or ownCloud instance.
The encryption is done on the client and server side with AES256 bit encryption' and is a password manager in the web browsers category. There are more than 100 alternatives to Passman for a variety of platforms, including Windows, Mac, Android, iPhone and Web-based apps. The best Passman alternative is Bitwarden, which is both free and Open Source. Other great apps like Passman are KeePassXC, KeePass, Proton Pass and LastPass.