Skype for Slack - Move your slack discussions to a group skype call
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Calls on Slack - Make voice calls in Slack
Kixie - Better sales, made simple. Engage customers more effectively with Kixie's ultra-reliable voice & text dialer and easy automations.
Pingly - Your communication hub — Email, text & voice in one app
CloudTalk - Work locally, grow globally