VideoScribe - Make your own whiteboard video animations with Sparkol VideoScribe – award-winning video scribing app for PC, Mac and iPad. Free trial available.
Slack - A messaging app for teams who see through the Earth!
Smoothboard Air - Smoothboard Air is a collaborative interactive whiteboard application for iPads and Android devices that revolutionizes interaction in lecture rooms.
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.
RM Easiteach - RM Easiteach is a brand new and a trendy interactive program for your classroom, for use on any whiteboard, projectors and other hardware devices.
Witeboard - A real-time whiteboard for your team. No signups required.