The best open source alternative to Google Groups is Framalistes. If that doesn't suit you, our users have ranked more than 25 alternatives to Google Groups and six of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Google Groups are Mailman, Mailing Group - Listserv, GroupServer and Easy Redmine.
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.
No hosted version from supplier
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.
Its a really nice Google groups and Yahoo groups alternative listserv mailing list plugin.
Email lists, with an integrated web interface, and control. Administering large mailing list sites
Are you sick of the limitations of open source MLMs, but not ready to give up control to a web-delivered service? Give your users a web interface
Let your users read and post mess.
Adaptive suite integrating project, IT service, and source code management for technology teams, featuring time tracking, issue and document management, customizable dashboards, third-party integration, agile and waterfall support, and cloud deployment options.
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. That means you don't have to worry about too many people signing up, nor the amount of...
France
EU
United States
United Kingdom
It's a free service with no ads, tracking or selling our data. It's based on email which nearly everyone has already and do not required a new account.