vaultwarden is a free Rust-based implementation of Bitwarden that works with the Bitwarden client. Password Store (pass) is also a great password manager with multiple clients and frontends.
Edited to add: I would mention that I personally use KeePass and love it to death though - my SO and I have vaults we occasionally sync and it's a wonderfully simple and easy to use application for anyone with confidence in keeping the password vault secured and a backup ready.