The world's leading open source portal
Liferay Portal is the world's leading enterprise open source portal framework, offering integrated Web publishing and content management, an enterprise service bus and service-oriented architecture, and compatibility with all major IT infrastructure.
Feed reader/aggregator that supports RSS and Atom formats. Its plugin architecture make it extensible and it runs under Windows, Linux, Mac OSX, and etc.
The Meldware Communications Suite (MCS) is a platform-independent groupware package consisting of: Meldware Mail, Meldware Calendar, Meldware Webmail, Meldware Secure Administration System. It provides IMAP, POP, SMTP, iCal, WCAP, and Webmail services.