Discourse is the 100% open source discussion platform built for the next decade of the Internet. Use it as a mailing list, discussion forum, long-form chat room, and more!
Self hosted email newsletter app
Murmur is a new tool for group communication that blends concepts from mailing lists, forums, and social media. Now members can choose how they receive emails and collaboratively moderate discussion.
sr.ht is a network of useful open source tools for software project maintainers and collaborators, including git repos, bug tracking, continuous integration, and mailing lists.