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

Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.

Vivox - Vivox is called to be one of the leading chatting platforms for online gamers.

Shutter - Shutter is a feature-rich screenshot program.

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

Snipping Tool - Use Snipping Tool to capture a screen shot, or snip, of any object on your screen, and then annotate, save, or share the image