Wing-project.org - WING - Wireless Mesh Network for Next-Generation Internet

Zoho Meeting - Free video conferencing, online meeting, desktop sharing solution from Zoho.

Phonebot - Make phone calls from within a Slack channel

Airtime - Hang out with group video, share music & videos

HideMyFaceTime - Stop watching your own face during FaceTime calls.

Voxox CloudPhone - Get a local or toll-free business number that automatically answers, routes and transfers calls, plus other professional business phone services.