Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...

Scribblar - Scribblar is a free online collaboration tool that is perfect for online tutoring.

Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.

NoteBookCast - A real time shared whiteboard in your browser, teach, explain, sketch. For work, study, fun.

RaidCall - Free & Light. Setting up is fast and easy; with no need to rent or set up servers. Low CPU usage and minimum memory footprint allows for smooth, uninterrupted communication. im. Group Communication.

OpenBoard - The OpenBoard software is an interactive white board software.