Not many out there. Search the forum and several are discussed. npopw (freeware). The interface is a bit awkward and it does not organize its file structure, but it has many improvements over the native inbox offering, including the ability to delete mails from the device but leave them on the pop3 server, saving messages on storage cards and a few other niceties. i think you will get a lot of votes for WebIs.
I'm using Webis Mail, but since you said other than... I will be of no help...
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