6to5
Turn ES6 code into readable vanilla ES5 with source maps
Testcafe
A Node.js tool to automate end-to-end web testing.
Type Script
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
Grunt
Grunt: The JavaScript Task Runner
Fast Check
Property based testing framework for JavaScript (like QuickCheck) written in TypeScript
Platform
Reactive libraries for Angular
Ar.js
Image tracking, Location Based AR, Marker tracking. All on the Web.
Xv
:x: :heavy_check_mark: A beautifully simple and capable test runner
Stencil
A Web Component compiler for building fast, reusable UI components and Progressive Web Apps 💎 Built by the Ionic Framework team
Reef
A lightweight library for creating reactive, state-based components and UI.
Sinon.js
Test spies, stubs and mocks for JavaScript.
Prettydiff
Compare code instead of text.
Rulers Guides.js
Creates Photoshop-like guides and rulers interface on a web page
Thrill
Runs tests in many browsers.
Apitizer
API mocking for client JavaScript applications
Jscritic
Quickly check how well 3rd party script behaves.
Boomerang
End user oriented web performance testing and beaconing