vBulletin - Build a community website with the leading forum software, vBulletin 5 Connect, or in the cloud on vB Cloud!
Telbee.io - telbee adds voice messaging to podcasts, websites, social media and email to easily hear from and build human relationships with your customers and community - save time, reduce frustration, and gain sales, understanding and fans
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
Vocaroo - Vocaroo is a quick and easy way to share voice messages over the interwebs.
Flarum - Flarum is the next-generation forum software that makes online discussion fun. It's simple, fast, and free.
statuspage - A simple self-hosted status page site with an API written in Django under the BSD license.