Not sure why open suse does not have a password management toolset. You can manually add this URL to your list of Repositories through Yast. When you search for Keepassx the software install will be there.
http://download.opensuse.org/repositories/security:/passwordmanagement/openSUSE_11.4/
http://download.opensuse.org/repositories/security:/passwordmanagement/openSUSE_12.1/