Inferno - An extremely fast React-like javascript library for building modern user interfaces.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Preact.js - Preact is a fast 3kB alternative to React with the same modern API. Components & Virtual DOM.
Shutter - Shutter is a feature-rich screenshot program.
w2ui - W2UI is a small JavaScript UI library with a complete set of widgets: layout, grid, sidebar, toolbar, tabs, fields, popup, utilities.
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