Non self-hosted: Bitwarden
Self-hosted: Keepass
Both are open-souce, multi-platform, and free. Bitwarden does have additional paid tiers to include support for things like OTPs. I used to use Keepass but got tired of manually syncing my database; If that's not a problem for you then it's a great choice.
Since my tabletop game got canceled today... Relax from doing yard work yesterday, maybe work on my programming project a bit. Or trim the plants outside if it gets cool enough later.