Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
Skype for Slack - Move your slack discussions to a group skype call
Spectrum - Browser-based app to visualize the frequencies of an audio file.
Aircall Now - Make voice calls inside Intercom Messenger 📞💬
HandsFree 2 - Call and SMS in Mac using your Android phone via Bluetooth
GraphJS - Make any website social