GroupOffice is a groupware suite that takes your office online, implementing online collaboration and CRM. It allows you to share projects, calendars, files and email online with co-workers and clients. It is easy to use and fully customizable. It also features synchronization with PDAs and Outlook.
MIMP is a version of the popular webmail client IMP intended for mobile phones and PDAs. Basic webmail functionality is implemented, including mailbox viewing and paging, viewing messages, deleting, replying, forwarding, and composing new messages. It utilizes the Horde Application Framework.
Roundcube Webmail is a browser-based, multilingual IMAP client with an application-like user interface. It provides the full functionality you expect from an email client, including MIME support, address book, and folder manipulation. High extensibility is granted by the plugin API and the user interface is fully skinnable using XHTML and CSS 2.
The POP and IMAP troubleshooter serves to diagnose and solve connection problems from client machines to email services. It reads the client configuration files (Outlook, Windows Mail, Thunderbird, etc.), checks the individual settings, and then attempts to create POP, IMAP, and SMTP connections using these settings. The troubleshooter is coded in C++ using the Qt environment. It can be used generically, or can be customized for the demands of a particular email service.