toolani - Cheap international calls
RemindUs - Advanced reminders for Slack teams
KeepCalling - Best Rates for International Calls. No Contract, Expiry, or PIN. Use Any Phone, Smartphone or PC.
Slack - A messaging app for teams who see through the Earth!
Rebel Calling - Internet-free international calling for $1 a month
Workplace by Facebook - Connect everyone in your company and turn ideas into action.