An HTML5 Presentation Editor. A GUI / Authoring Tool for ImpressJS and Bespoke.js
Source at https://github.com/tantaman/Strut

YunoHost is a server operating system aiming to make self-hosting accessible to everyone.

Hack is a programming language for HHVM. Hack reconciles the fast development cycle of a dynamically typed language with the discipline provided by static typing, while adding many features commonly found in other modern programming languages.
Hack provides instantaneous type checking by incrementally checking your files as you edit them. It typically runs in less than 200 milliseconds, making it easy to integrate into your development workflow without introducing a noticeable delay.
It is backward compatible with PHP and provides tool to convert from one to the other.

Laravel Generator to generate CRUD, APIs, Test Cases and Swagger Documentation

slacktee is a bash script that works like tee command. Instead of writing the standard input to files, slacktee posts it to Slack.

PhpMetrics provides various metrics about PHP projects. PhpMetrics is designed to be understable and easy to use. Thanks to d3js, it will scores your project with beautiful graphs. PhpMetrics interacts with Jenkins or Sonar. It provides reports in many formats (XML, violations, HTML, CSV...). PhpMetrics can be extended with plugins (Symfony2...).

A simple, accessible HTML5 media player

RethinkDB is the first open-source, scalable JSON database built from the ground up for the realtime web. It inverts the traditional database architecture by exposing an exciting new access model – instead of polling for changes, the developer can tell RethinkDB to continuously push updated query results to applications in realtime. RethinkDB’s realtime push architecture dramatically reduces the time and effort necessary to build scalable realtime apps.

RethinkDB Horizon is an open-source developer platform for building realtime, scalable web apps. It is built on top of RethinkDB, and allows app developers to get started with building modern, engaging apps without writing any backend code.

Horizon consists of three components:

Horizon server: a middleware server that connects to/is built on top of RethinkDB, and exposes a simple API/protocol to front-end applications.
Horizon client: a JavaScript client library that wraps Horizon server’s protocol in a convenient API for front-end developers.
Horizon CLI: a command line tool, hz, aiding in scaffolding, development, and deployment.

Træfɪk is a modern HTTP reverse proxy and load balancer made to deploy microservices with ease. It supports several backends (Docker, Swarm, Mesos/Marathon, Kubernetes, Consul, Etcd, Zookeeper, BoltDB, Rest API, file…) to manage its configuration automatically and dynamically.

A compact, cross-browser solution for using the JavaScript Notifications API

nlp_compromise does NLP in the browser. It's a handy, and not overly-fancy tool for understanding, changing, and playing with english. We've also got a modest, though ambitious plugin ecosystem.

Waybackpack is a command-line tool that lets you download the entire Wayback Machine archive for a given URL.

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.

Save requests and organize your APIs into Collections. Create and send any HTTP request using the awesome Postman request builder. Write your own test cases to validate response data, response times, and more! Collaborate in real-time over your team’s shared APIs. Make sure everyone is always on the same page. Test public APIs in one click using the Run in Postman button.

The coach helps you find performance problems on your web page. Think of the coach as a modern version of YSlow. The coach will give advice of how your page can be faster.

Looks good to me (LGTM) is the most popular comment on Github, perhaps. But LGTM is boring. So we spice it up with some images.

New Relic’s SaaS-based Application Performance Monitoring helps you build, deploy, and maintain great web software.
Also, server monitoring, and more.

OWASP Mutillidae II is a free, open source, deliberately vulnerable web-application providing a target for web-security enthusiest. Mutillidae can be installed on Linux and Windows using LAMP, WAMP, and XAMMP. It is pre-installed on SamuraiWTF, Rapid7 Metasploitable-2, and OWASP BWA. The existing version can be updated on these platforms. With dozens of vulns and hints to help the user; this is an easy-to-use web hacking environment designed for labs, security enthusiast, classrooms, CTF, and vulnerability assessment tool targets. Mutillidae has been used in graduate security courses, corporate web sec training courses, and as an "assess the assessor" target for vulnerability assessment software.

Vue.js is a library for building interactive web interfaces. It provides data-reactive components with a simple and flexible API. Core features include:

Dead simple, unobtrusive reactivity using plain JavaScript objects.
Component-oriented development style with tooling support
Lean and extensible core
Flexible transition effect system
Fast without the need for complex optimization