FruMailer is a project written in Perl/Tk that aims to be an e-mail client (MUA) with a small, fast, light, and simple GUI interface.
PyWebMail is a Python library and POP3 gateway that allows you to work with webmail servers as if they were POP3 or IMAP mail servers. Currently, support for Mail.Com, Yahoo! Mail, Gmail, Netscape, HotMail and some minor servers is finished.
A templating system for Java servlets.
A powerful and easy-to-use firewall builder for Linux which uses an elegant language.