LyteSpark - Host online meetings in your own branded room
Skype for Slack - Move your slack discussions to a group skype call
GoToMeeting Free - Free online meetings for up to 3 people
Calls on Slack - Make voice calls in Slack
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
Pingly - Your communication hub — Email, text & voice in one app