Collaboration software has of recent gained vast popularity. The ability of people, located at physically distinct locations, to collaborate on a common platform and perform tasks as if they were actually physically present at the same location is made possible only through collaboration software. These applications provide the means to share data, perform tasks and track projects from different locations.
Some of the collaboration software available are Zimbra, Netoffice, Egroupware and phpcollab.
Zimbra
Zimbra Collaboration Suite is one the more popular Open Source collaboration tools available on the Net, providing solutions for the Mac and Linux platforms. Developed around AJAX-based collaboration, it integrates a powerful web client, e-mail, contacts, calendar, VoIP as well as online document authoring and sharing.
Egroupware
Egroupware is a platform independent, enterprise ready groupware software/sever. Its features include the ability to manage contacts, appointments and more for the whole business. It comes with a web interface which allows you to access your data from anywhere in the world. You also have the choice of using your own client, be it Evolution, Kontact or Outlook and even your mobile phone/PDA.
phpCollab
phpCollab is an open source internet-enabled system for use in projects that require collaboration over the internet. Those organizations, such as consulting firms, that rely on a division between firm-side and client-side information will benefit most from use of phpCollab


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Thanks for sharing free collaboration tools
thanks for sharing 3 awesome collaboration tools
Another option for online collaboration solutions is OnePlace. It is available on a free trial, as well as a free plan for smaller business teams, and brings communication, collaboration, file sharing and work management together for an effective online business solution. You can check it out at http://www.oneplacehome.com if you’re interested.
Thanks Dana for comment will surely check it out.