Analytics
Plausible is a lightweight and open source Google Analytics alternative Your website data is 100 yours and the privacy of your visitors is respected

JavaScript libraries
Touch enabled jQuery plugin that lets you create beautiful responsive carousel slider

JavaScript libraries
jQuery The Write Less Do More JavaScript Library

JavaScript libraries
Dropzone js is an open source library that provides beautiful and easy to use drag n drop file uploads with image previews

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