Widgets
Pinterest is an image sharing and social media service designed to enable saving and discovery of information

Miscellaneous
Positioning tooltips and popovers is difficult Popper is here to help Popper is the de facto standard to position tooltips and popovers in modern web applications

Issue trackersSurveys
UserReport is a set of free easy to use tools that tell you who your users are and what they want to achieve

CDN

Ecommerce
The World Wide Web Consortium W3C develops standards and guidelines to help everyone build a web based on the principles of accessibility internationalization privacy and security