Skype for Slack - Move your slack discussions to a group skype call
Quick License Manager - Quick License Manager (QLM) is a license protection framework that creates professional and secure license keys to protect software against piracy.
Calls on Slack - Make voice calls in Slack
Labs64 NetLicensing - Monetize your digital products and services
CallKite - Your website’s video call center in just one click.
LicenseSpring - Reliable and easy to use License-As-A-Service (LaaS) for for any software application