Full Page Screen Capture - I built a Chrome Extension that allows you to save a screenshot of an entire webpage as an image
Annotable - Ultimate image annotation & markup tool
Webshot - Free and Open Source screenshot website service
Hover Me - Hover me lets you quickly annotate any image and easily integrate an interactive version within your own website.
Screenshot Designer - Create engaging App Store screenshots
Picsell.ia - Annotate datasets smarter, 10x faster & cheaper.