ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
SingleFile - Save a complete page into a single HTML file
ScreenToGif - This tool allows you to record a selected area of your screen and save as a animated gif.
Awesome Screenshot Minus - Open-source, less intrusive variant of Awesome Screenshot
recordit.co - Make a short video capture of your desktop as a gif.
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.