Natron - Natron is a piece of software designed for compositing purposes, and it is entirely free and open source. The software is node-based, which makes it easy to use and customize. Read more about Natron.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
NUKE - Our industry-leading Nuke Studio, NukeX & Nuke offers cutting-edge toolkits covering node-based compositing, editorial and finishing.
LightShot - The fastest way to take a customizable screenshot.