Roundcube - Web-based IMAP email client
MAMP - MAMP is the abbreviation for Macintosh, Apache, MySQL, and PHP. It is a reliable application with its four components that allows you to access the local PHP server as well as the database server (SQL).
HEY - Email at its best, new from Basecamp.
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies