Open Source Google Groups Alternatives

This server provides you access to your environment on mailing list server. Starting from this web page, you can perform subscription options, unsubscription, archives, list management and so on.

Mailman is integrated with the web, making it easy for users to manage their accounts and for list owners to administer their lists. Mailman supports built-in archiving, automatic bounce processing.

Email lists, with an integrated web interface, and control.

Easy Redmine is a web based collaborative project management application. It is used by companies from around the world to handle projects, tasks, schedules, resource utilization, budgets, attendance monitoring, support management and much more.

FreeLists provides the internet community with Free, no-hassle, high-quality mailing lists. We don't use advertisements and we don't charge for higher-than-a-certain-volume lists.

Allows you to run a free Listserv or email group right from your WordPress dashboard. Its the best two-way communication group email plugin in wordpress where an email sent to the main group email gets forwarded to the all group members.

Cloud-based software application for consulting firms (and students) with all the tools required in a real office to run projects, teams and companies profitably.

Perl software that allows users to read Usenet messages and post messages using only a web browser. Deja.com and others offers such a (non-GPLed) gateway between Usenet and the WWW.