Uppload is a better JavaScript image uploader. It’s highly customizable with 30+ plugins, completely free and open-source, and can be used with any file uploading backend.

Single-spa is a javascript framework for front-end microservices. Use multiple frameworks in a single-page application, allowing you to split code by functionality and have Angular, React, Vue.js, etc. apps all living in harmony.

Easily create sites that work offline as well as online. UpUp is a tiny JavaScript library that makes sure your users can always access your site's content, even when they're on a plane, in an elevator, or 20,000 leagues under the sea.