Sociall (Beta) - A secure and private decentralised social network for all.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Manyverse - A social network off the grid
LightShot - The fastest way to take a customizable screenshot.
data.world - The social network for data people
Snagit - Screen Capture Software for Windows and Mac