Skype for Slack - Move your slack discussions to a group skype call
Smart Slack Reminders - Schedule follow-up questions to any message in Slack 💬
Aircall Now - Make voice calls inside Intercom Messenger 📞💬
RemindUs - Advanced reminders for Slack teams
HandsFree 2 - Call and SMS in Mac using your Android phone via Bluetooth
PullReminders - Review and release pull requests faster with Slack reminders and metrics.