ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Sketchboard.io - Visual Remote Teamwork. Solve problems and create ideas on endless whiteboard with your teammates by sketching.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Draw.Chat - Anonymous real-time whiteboard with text and video chat.
LightShot - The fastest way to take a customizable screenshot.
Bluescape - Bluescape is a visual collaborative workspace designed to elevate work that empowers creation, collaborate, and innovate across the entire enterprise.