1)   Barca 2.0
Barca is a seamless integration of a powerful email program, personal information manager, planner and RSS. Aimed at the professional and small business market, Barca provides a single interface to manage all your information in a safe environment.
calendar, planner, notes, tasks, todo, RSS, diary, email, mail, pop,

 2)   PocoMail 4.0
A powerful email program that does not compromise your privacy or security. The streamlined interface never gets in your way, with many unique features that allow you to conquer your mailbox: fast searches, full-page preview, Bayesian filters...
email, mail, pop, smtp, imap, ssl, rss, bayesian, address book, group,