Slack - A messaging app for teams who see through the Earth!
GitShowcase - Plug and play portfolio for developers
Smoothboard Air - Smoothboard Air is a collaborative interactive whiteboard application for iPads and Android devices that revolutionizes interaction in lecture rooms.
GPortfolio - Create an automatic portfolio based on Github profile.
Groupboard - Free collaborative online whiteboard, web conferencing and online tutoring software that can be embedded in your own website. Used by many online tutors, schools and universities.
Appolo - Static app portfolio for developers