Description: Mailman is an open source mailing list management system. It helps manage email discussion and announcement lists, allowing users to subscribe and unsubscribe, and helping admins moderate and post to the lists.
Type: software
Pricing: Free
Description: Nabble is an open-source communication and collaboration platform that allows teams and communities to have discussions online. It provides forums, chat rooms, wikis, blogs and more in one integrated platform.
Type: software
Pricing: Open Source