Depends on what qualifies as a password "manager", but I've been using pass (https://www.passwordstore.org/) for years on multiple desktops, and have recently added iOS app sepass to my setup (https://sepass.modiot.com/).
Quite complicated to get it all setup (definitely not for non-technical users), but both are GPL and I now have all my passwords available with hardware protection (yubikey on desktop, secure enclave on iOS) in all locations.