Mockable - Quickly define some REST or SOAP endpoints and have them return json/xml (dummy) data.
Apache Tika - Apache Tika toolkit detects and extracts metadata and text from different file types.
Postman - The Collaboration Platform for API Development
highlight.js - Highlight.js is a syntax highlighter written in JavaScript. It works in the browser as well as on the server.
MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.
Bootstrap Table - Bootstrap Table has been designed to reduce development time and to require no specific knowledge from developers.