DataMask.tech Editor - Blur sensitive information and redact images with online screenshot editor

Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.

Sumo Paint - Photoshop in your browser, Sumo Paint an advanced browser-based image editor.

Shutter - Shutter is a feature-rich screenshot program.

Pixelmator - Pixelmator is an image-editing application for Mac and iPad.

Snipping Tool - Use Snipping Tool to capture a screen shot, or snip, of any object on your screen, and then annotate, save, or share the image