PenPal World - Connect with people all over the world
Communifire - Enterprise Social Collaboration Software
Nido - Slack for college students
Workplace by Facebook - Connect everyone in your company and turn ideas into action.
Frysbe - Frysbe: Make global friends at random and the fling app comes up with features to send messages to strangers from every corner of the world to expand your social circle.
DigitalChalk - Online Training Software and Learning Management System (LMS)