Horde is both an Open Source software project and an application framework written in PHP.
The application framework is currently the basis for 50 applications written by developers from around the
... [More] world, including the flagship IMP Webmail client, the popular Chora repository viewer, and a complete groupware suite. The guiding principles of the Horde Project are to create solid standard-based applications using intelligent object oriented design, and wide-ranging platform and backend support. There is great emphasis on making Horde as friendly to non-English speakers as possible. The Horde Framework currently supports many localization features such as unicode and right-to-left text, and is shipped with translations in over 40 languages. [Less]
Citadel is a highly integrated Groupware Platform with a Web 2.0 enabled Web interface, but also providing SMTP, IMAP, POP3 and GroupDAV access to its content.
Citadel offers Versatile email
... [More] services with very low administration needed. It provides its own implementations of these server protocols:
Imap, Pop3, SMTP, ManageSieve, Citadel. [Less]
Bongo is an easy-to-use mail and calendar system, offering a simple yet powerful user interface. The goal is to make sharing, organisation, and communication simpler, quicker, and more useful.
Buni is a community of open source software developers and users dedicated to the research and development of communication and collaboration software. Buni offers Meldware Communications Suite with
... [More] Mail, a Calendar Server, Webmail, and a Secure Administration System. [Less]
NOCC is a simple and fast Webmail client which can handle POP3, SMTP, and IMAP servers. It is written with PHP4 (uses sessions), has low requirements (no database, frames). Features multi-language support, MIME attachments, displays HTML messages.
SME Server is a leading distribution for small and medium enterprises. It stands apart from the competition by shipping with most common functionality preconfigured and features a number of popular
... [More] additional enhancements in the form of downloadable 'contributions'. It is published under the GPL license and while freely available, a small donation is requested. [Less]
Scalix Community Edition is a product we’ve packaged and made available for free so every organization can try out and use our robust messaging solution.
It includes Scalix Collaboration Platform
... [More] – which serves as the foundation for all our product editions – and 25 Premium User mailboxes.
As such, Community Edition is a field-proven, commercial grade email platform.
As with all Scalix editions, it has a flexible, open architecture, and supports Outlook, Evolution, Scalix Web Access, and any IMAP or POP client. [Less]
FreePOPs is a POP3 server that is scriptable in LUA. This means that you can tailor it to your needs by writing a plugin. Plugins are currently implemented for using FreePOPs as an RSS aggregator, a
... [More] POP3 forwarding server, and a POP3 interface to the webmail services of libero.it, inwind.it, iol.it, blu.it, lycos.it, tin.it, virgilio.it, gmail.com, aol, hotmail, fastmail, mail2world, yahoo and many more (see the Web site for an exaustive list). [Less]
AtMail is an open source webmail client written in PHP under the Apache 2.0 license.
The project aim is to provide a elegant Ajax webmail client for existing IMAP mailservers, with less bloat and a
... [More] focus on an intuitive, simple user interface.
Features include complete Webmail functionality, Address-book support, Videomail, Ajax interface, Drag'n'drop and more. [Less]
using Ruby as the tool to store all the incoming email to sql server ( mysql , mssql , oracle etc ) , so that the external program can directly access the email without using the POP, IMAP protocol.
... [More]
This can also use as a backend of the webmail server, and make use of the ROR (ruby on rails) to build the Web2.0 email application just like gmail [Less]