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KeePassX uses the KeePass 2 (.kdbx) password database format as the native format. It can also import (and convert) the older KeePass 1 (.kdb) databases.
As of December 2021, KeePassX is no longer actively maintained.
There is a community fork of KeePassX, called KeePassXC.
^ Frydman, Ricardo (2016-05-11). "Managing passwords in Linux with KeePassX". Retrieved 2020-01-13. KeePassX started as a Linux port of KeePass, which was at that time an open source but Windows-only password manager