Humbug is a Mutation Testing framework for PHP to measure the real effectiveness of your test suites and assist in their improvement. It eats Code Coverage for breakfast.

Feathers is a real-time, micro-service web framework for NodeJS that gives you control over your data via RESTful resources, sockets and flexible plug-ins.

Protractor is an end-to-end test framework for AngularJS applications. Protractor runs tests against your application running in a real browser, interacting with it as a user would.

Spectre.css is a lightweight, responsive and modern CSS framework for faster and extensible development.

lightweight and clean starting point for your project and prototype
flexbox, responsive and mobile-friendly layout
carefully designed elements
built in useful components and utilities

Frisby is a REST API testing framework built on node.js and Jasmine that makes
testing API endpoints easy, fast, and fun. Read below for a quick overview, or
check out the API documentation.

Open source HTML5 hybrid app framework for PhoneGap & Cordova
Mobile-optimized HTML5, CSS and JavaScript with Web components
Responsive layout, Material and Flat design

Bash Infinity is a standard library and a boilerplate framework for writing tools using bash. It’s modular and lightweight, while managing to implement some concepts from C#, Java or JavaScript into bash. The Infinity Framework is also plug & play: include it at the beginning of your existing script to import any of the individual features such as error handling, and start using other features gradually.

MJML is a markup language designed to reduce the pain of coding a responsive email. Its semantic syntax makes it easy and straightforward and its rich standard components library speeds up your development time and lightens your email codebase. MJML's open-source engine generates high quality responsive HTML compliant with best practices.

A client side framework for hypertext interactive fiction games

2D+3D game making for indies

Tone.js is a Web Audio framework for creating interactive music in the browser. The architecture of Tone.js aims to be familiar to both musicians and audio programmers looking to create web-based audio applications. On the high-level, Tone offers common DAW (digital audio workstation) features like a global transport for scheduling and timing events and prebuilt synths and effects. For signal-processing programmers (coming from languages like Max/MSP), Tone provides a wealth of high performance, low latency building blocks and DSP modules to build your own synthesizers, effects, and complex control signals.

Build cross platform desktop apps with web technologies

SHML is a shell framework for faster and easier script development. HTML has CSS, Unix-like shells have ANSI/VT100 Control Sequences. SHML makes is easy to apply style to your shell scripts without trying to remember that yellow is \033[33m instead it's $(color yellow).

Flocking is a JavaScript audio synthesis framework designed for artists and musicians who are building creative and experimental Web-based sound projects.

The beautiful, open source front-end SDK for developing hybrid mobile apps with HTML5.

ngCordova is a set of AngularJS extensions on top of the Cordova API to make it easier to build, test, and deploy Cordova apps with AngularJS.

Codeception PHP Testing Framework is designed to work just out of the box. This means its installation requires minimal steps and no external dependencies preinstalled (except PHP, of course). Only one configuration step should be taken and you are ready to test your web application from an eye of actual user.

Sails.js make it easy to build custom, enterprise-grade Node.js apps. It is designed to mimic the MVC pattern of frameworks like Ruby on Rails, but with support for the requirements of modern apps: data-driven APIs with scalable, service-oriented architecture. It's especially good for building chat, realtime dashboards, or multiplayer games.

The kraken suite is a secure and scalable layer that extends express by providing structure and convention.

A Responsive Email Framework from ZURB. Quickly create responsive HTML emails that work on any device & client. Even Outlook.