Vaadin Framework - Vaadin is a web application framework for Rich Internet Applications (RIA).
Skype for Slack - Move your slack discussions to a group skype call
Spring Framework - The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.
Calls on Slack - Make voice calls in Slack
Flapper - Indulge in a private jet experience
CallKite - Your website’s video call center in just one click.