ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
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.
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
LightShot - The fastest way to take a customizable screenshot.
GSC - With GSC, you can pick from any of 14 worldwide datacenters to host your own free voice server.