VersionPress is a free and open source version control plugin for WordPress built on Git. You can:

Undo changes
Create staging sites
Merge databases  ← yes, really!

Simply update your sites with confidence.

DuckRails is a development tool.

Its main purpose is to allow developers to quickly mock API endpoints that for many possible reasons can't reach at a specific time.

Mailtrain is a self hosted newsletter application built on Node.js (v5+) and MySQL (v5.5+ or MariaDB). Mailtrain supports subscriber list management, list segmentation, custom fields, email templates, large CSV list import files, etc.

Vegeta is a versatile HTTP load testing tool built out of a need to drill HTTP services with a constant request rate. It can be used both as a command line utility and a library.

The global fetch function is an easier way to make web requests and handle responses than using an XMLHttpRequest. This polyfill is written as closely as possible to the standard Fetch specification at https://fetch.spec.whatwg.org.

azk is an open-source orchestrator for local development environments.

Game-icons.net is an online repository providing heaps of cool game related graphics.

They are provided provided under the terms of the Creative Commons 3.0 BY license.

Ace = JavaScript + Native UI + iOS + Android
for Apache Cordova

Add native power to your shared JavaScript codebase
Works with Ionic, PhoneGap, and all Cordova-based projects

ZippList is a super simple directory that features a hand picked selection of the very best, free resources and tools for creatives.

We’ve scoured the internet for the most awesome sites that feature free stock photography , mockups, icons, graphics, video, audio, colour swatches, textures and tools – so you don’t have to.

Caddy is a lightweight, general-purpose web server for Windows, Mac, Linux, BSD and Android. It is a capable alternative to other popular and easy to use web servers. (@caddyserver on Twitter)

The most notable features are HTTP/2, Let's Encrypt support, Virtual Hosts, TLS + SNI, and easy configuration with a Caddyfile. In development, you usually put one Caddyfile with each site. In production, Caddy serves HTTPS by default and manages all cryptographic assets for you.

PlatformIO is an open source ecosystem for IoT development
Cross-platform build system. Continuous and IDE integration. Arduino and MBED compatible

stackoverflow from the terminal.
how2 finds the simplest way to do something in a unix shell. It's like man, but you can query it in natural language.

A mighty, modern CSS linter that helps you enforce consistent conventions and avoid errors in your stylesheets.

We extracted the colors from 20 million Creative Commons images on Flickr to make the images searchable by color.

A painless self-hosted Git service.

Portia is a tool that allows you to visually scrape websites without any programming knowledge required. With Portia you can annotate a web page to identify the data you wish to extract, and Portia will understand based on these annotations how to scrape data from similar pages.

The pluggable linting utility for JavaScript and JSX

Library to detect when DOM elements become visible and disappear on scroll.

Rancher is open source software that makes it simple for organizations to deploy a private container service and deliver Docker orchestration to users. Within a team, authorized users are able to create resource pools from any hosts, and then launch containers or application templates from Rancher’s UI or CLI. Users have complete control over how their applications are deployed, and Rancher provides all of the necessary infrastructure services such as networking, load balancing, and storage to ensure the application runs brilliantly on any infrastructure.

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.