Passbolt https://www.passbolt.com/ might be an interesting alternative. The feature set looks pretty good at first sight. The only real downside I see so far is that it doesn't have macOS and Linux apps. Other than Bitwarden it is real open source.
Doesnt have individual plans, you can only selfhost it unless you subscribe for at least 10 users or more - makes it basically useless as a personal bitwarden alternative unfortunately.