ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Awesome Screenshot Minus - Open-source, less intrusive variant of Awesome Screenshot
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Save Page WE - Download Save Page WE for Firefox. Save a complete web page (as curently displayed) as a single HTML file that can be opened in any browser. Choose which items to save. Define the format of the saved filename. Enter user comments.
LightShot - The fastest way to take a customizable screenshot.
BrowseShot - BrowseShot lets you capture a PNG of the full scrollable area of a website.