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Bitwarden Open Source Password Manager
(bitwarden.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
I love vaultwarden. Been using the beta builds to have auto sync work on mobile now. High quality service!