Annotable - Ultimate image annotation & markup tool
Screenshot Tracker - Capture and keep track of full-sized web page screenshots
Hover Me - Hover me lets you quickly annotate any image and easily integrate an interactive version within your own website.
Webshot - Free and Open Source screenshot website service
Picsell.ia - Annotate datasets smarter, 10x faster & cheaper.
Screenstab - A tool to turn ordinary screenshots into beautiful image assets