Sylpheed - GTK+ based e-mail client for XWindows. Pronto - Themeable, GTK-based mail client written in Perl. Supports POP3, display of HTML mail. TkMail - v2.0 is an X windows interface to reading mail built using Tcl/Tk and Perl. TradeClient - A full-featured e-mail client with support for SMTP, POP3, basic IMAP, and LDAP support for a global address book. Postilion - A clone of the NeXT Mail.app for the X Windows system. TkRat - Tcl/Tk mail client, also known as Ratatosk . Althea - An IMAP client for X Windows that uses the GTK widget set. It allows an almost unlimited number of servers, and has a very small memory footprint. Spruce - Mail client written with the Gtk+ widget set. Supports POP3 and IMAP.