Deku - Functional view library for building UI components as an alternative to React
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.
Glimmer - Fast and light-weight UI components for the web
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