Zimbra Collaboration Suite
Freemium
Zimbra offers an open source email platform for the enterprise.
OX Open-Xchange
Open Source
OX Open-Xchange is a web-based communication, collaboration and office productivity software.
Kopano
Open Source
Kopano is an open-source groupware application suite originally based on Zarafa.
Compare Kolab Community with alternatives
Compare Zimbra Collaboration Suite and Kolab Community and decide which is most suitable for you.
Compare Kopano and Kolab Community and decide which is most suitable for you.
Compare OX Open-Xchange and Kolab Community and decide which is most suitable for you.