Zimbra Desktop
Free Personal
Zimbra Desktop is an offline client that lets you manage various email accounts in one desktop tool.
iRedMail
Open Source
iRedMail is a free, OpenSource mail server.
Active Collab
Commercial
Active Collab is a web-based project management tool.
Compare Feng Office with alternatives
Compare Zimbra Desktop and Feng Office and decide which is most suitable for you.
Compare Active Collab and Feng Office and decide which is most suitable for you.
Compare iRedMail and Feng Office and decide which is most suitable for you.