Skype for Slack - Move your slack discussions to a group skype call
Tendenci - Tendenci - The Open Source AMS is a cloud-based all-in-one management SaaS solution for Non-profits and Associations.
Calls on Slack - Make voice calls in Slack
Kajabi - Kajabi is the only Knowledge Commerce platform today with everything you need to market, sell, and deliver your knowledge online.
Pingly - Your communication hub — Email, text & voice in one app
WildApricot - WildApricot is a powerful cloud software to help you automate and simplify membership tasks.