Skype for Slack - Move your slack discussions to a group skype call
TidyHQ - Organization management tool to support membership, subscriptions, event planning, and outreach.
Aircall Now - Make voice calls inside Intercom Messenger 📞💬
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Calls on Slack - Make voice calls in Slack
Membee - Membee is web-based membership management software.