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.
iOS Stack - A curated collection of iOS resources for app builders
Capture by Techulus - The ultimate toolkit for converting HTML to image & PDF. Pay only for what you need.No Subscription.
Lightwell - App creation platform for creatives.
Urlbox.io - Screenshot full page websites in retina resolution with Urlbox.io screenshot as a service API. Urlbox is the best provider of automated website screenshots offering many unique options and features.
AppToolkit - AppToolkit provides tools to build iOS screenshots, app landing pages, and to monitor app reviews