Roundcube - Web-based IMAP email client
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
HEY - Email at its best, new from Basecamp.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.