VoiceText for Slack - Voice notes w/ transcription in Slack
Skype for Slack - Move your slack discussions to a group skype call
Penman - A voice-driven note taking app 🗣️📝
Calls on Slack - Make voice calls in Slack
Tetra - Tetra is a call recording and analyzing program that allows you to focus on the conversation while it takes notes and remembers shortcuts for you.
Pingly - Your communication hub — Email, text & voice in one app