Capture2text - Capture2Text enables users to quickly OCR a portion of the screen using a keyboard shortcut.
Screenshot Machine - Screenshot machine is an online website capturing service. Creates a screenshot or thumbnail of any online web page in couple of seconds for free.
TextSniper - Instantly extract any text from your Mac's screen
URL2PNG - Screenshots as a Service. Capture snapshots of any website, right in your app, quickly and reliably.
HyperSnap - HyperSnap is a screen capture tool for Windows.
ApiFlash - ApiFlash is a powerful serverless screenshot API built with Chromium and AWS Lambda. It can easily scale to millions of screenshots per day and has an ever growing number of satisfied big clients.