Denigma : Denigma explains code in conversational English.
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Cypress : JavaScript End to End Testing Framework. Fast, easy and reliable testing for anything that runs in a browser.
Sourcegraph : Sourcegraph Server is a free, self-hosted code search server that integrates with your code host and supports multi-repository, regexp, and diff searc...
Babel : Babel will turn your ES6+ code into ES5 friendly code, so you can start using it right now without waiting for browser support.
Browserling : Live interactive cross-browser testing
Insight.io brings IDE-like code intelligence features such as cross-reference, class hierarchy and semantic search, right into your browser and helps developers to work with more productivity.