Sponsored by Vending Machine and Route Management Software
Mailr is an open source webmail application written in Ruby which uses Ruby On Rails web application framework. The application is tested with Courier-IMAP and Dovecot but it should be possible to use it with any other IMAP server.
Mailr is free and unencumbered public domain software. For more information, see http://unlicense.org/ or the accompanying UNLICENSE file.