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...
semgrep : semgrep is a tool for easily detecting and preventing bugs and anti-patterns in your codebase. It combines the convenience of grep with the correctnes...
Browserling : Live interactive cross-browser testing
Babel : Babel will turn your ES6+ code into ES5 friendly code, so you can start using it right now without waiting for browser support.
repl.it : Powerful and simple online compiler, IDE, interpreter, and REPL. Code, compile, and run code in 30+ programming languages. including JavaScript, Pytho...
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.