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 * [http://www.rainloop.net/ RainLoop Webmail]
 * [https://roundcube.net/ Roundcube - Free and Open Source Webmail Software]
 * [http://www.afterlogic.org/webmail-lite AfterLogic WebMail Lite PHP]

 * [http://codegeekz.com/best-webmail-clients-you-should-know/ Best Webmail Clients You Should Know | Code Geekz]
 * [http://www.noupe.com/development/10-ajax-webmail-clients.html 10 AJAX-based & PHP WebMail Clients For a Great User Experience - noupe]