Userfeed - Product feedback made for Intercom
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Fider - Fider is an open source, cross platform and free to use customer feedback platform for companies...
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
ClearFlask - Open-source Product Feedback Tool with a Public Roadmap and Announcements.
LightShot - The fastest way to take a customizable screenshot.