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Evolution provides integrated mail, addressbook and calendaring functionality to users of the GNOME desktop.
KDE PIM is sub project of KDE. Its goal is to provide an application suite to manage personal information. This includes mail, time, people and more. The main result is KDE Kontact, our personal information manager.
Ever wanted to get rid of Outlook ? DavMail is a POP/IMAP/SMTP/Caldav/LDAP gateway allowing users to use any mail/calendar client with Exchange, even from the internet through Outlook Web Access on any platform, tested on MacOSX, Linux and Windows
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 services with very low administration needed. It provides its own implementations of these server ... [More]
Chandler is an interpersonal information manager that adapts to your changing needs. Chandler offers innovative capabilities in calendar sharing to support workgroup collaboration. Chandler sharing is server-based, works across platforms and supports multi-author editing.
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 Mail, a Calendar Server, Webmail, and a Secure Administration System.