Pfaces is a graphical mail checker application which, if available, displays an icon/face/avatar of the sender. Pfaces supports POP3 and IMAP4 with and without SSL. It can fetch faces from gravatar.
mailcp is a simple program to copy from one mailbox to another. For example, it can move messages from an IMAPS mail store to a Maildir mail store. It uses libvmime and thus checks TLS/SSL certificates in a dependable and secure way.
A text editor aimed at developers.
An RPN calculator for the X Window system