Roundcube - Web-based IMAP email client
Gmail - Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
Yahoo Mail - Web-mail with a terabyte of free storage space & spam protection. Yahoo!
Rainloop - RainLoop is a web based email client.
Hushmail - Full-featured email service with integrated security to safeguard your data.