coala provides a unified interface for linting and fixing code with a single configuration file, regardless of the programming languages used. You can use coala from within your favorite editor, integrate it with your CI, get the results as JSON, or customize it to your needs with its flexible configuration syntax.

coala has a set of official bears (plugins) for several languages, including popular languages such as C/C++, Python, JavaScript, CSS, Java and many more, in addition to some generic language independent algorithms.

Shogun is and open-source machine learning library that offers a wide range of efficient and unified machine learning methods.

Imagine running your favorite Windows applications and drivers in an open-source environment you can trust. That's ReactOS. Not just an Open but also a Free operating system.

Radare is a portable reversing framework that can...

Disassemble (and assemble for) many different architectures
Debug with local native and remote debuggers (gdb, rap, webui, r2pipe, winedbg, windbg)
Run on Linux, *BSD, Windows, OSX, Android, iOS, Solaris and Haiku
Perform forensics on filesystems and data carving
Be scripted in Python, Javascript, Go and more
Support collaborative analysis using the embedded webserver
Visualize data structures of several file types
Patch programs to uncover new features or fix vulnerabilities
Use powerful analysis capabilities to speed up reversing
Aid in software exploitation

Don’t let your friends dump git logs into changelogs.

Scan, index, and archive all of your paper documents. Open Paperless is a re-think of the user interface and user experience for Mayan EDMS. The goal is to reduce the complexity and make it more suitable for home users.

Elixir is a dynamic, functional language designed for building scalable and maintainable applications.

Elixir leverages the Erlang VM, known for running low-latency, distributed and fault-tolerant systems, while also being successfully used in web development and the embedded software domain.

Fast and safe HTTP for the Rust language.

Iron is a fast and flexible middleware-oriented server framework that provides a small but robust foundation for creating complex applications and RESTful APIs. No middleware are bundled with Iron - instead, everything is drag-and-drop, allowing for ridiculously modular setups.

Perti is Wix’s holistic experiment system, it covers the lifecycle of product experimenting including A/B tests and feature toggles.

Motty provides the simpler way to test your client services.
It is a web application which gives you ability to create your own custom responses.
So you can intuitively and easily mock http responses. All you need to do is typing and click!

A Python one stop shop for all notification providers with a unified and simple interface.

Social server with an ActivityStreams API. It's a stream server that does most of what people really want from a social network.

Fireworq is a lightweight, high-performance, language-independent job queue system.

zines about systems & debugging tools

Stateless Password Manager : Stop wasting your time synchronizing your encrypted vault. Remember one master password to access your passwords, anywhere, anytime. No sync needed.

A real-time application for conducting Agile retrospectives with distributed teams.

Ncdu (NCurses Disk Usage) is a disk usage analyzer with an ncurses interface. It is designed to find space hogs on a remote server where you don't have an entire graphical setup available, but it is a useful tool even on regular desktop systems. Ncdu aims to be fast, simple and easy to use, and should be able to run in any minimal POSIX-like environment with ncurses installed.

A plugin-oriented tool for automating the investigation of broken hosts and services.

Flagr is an open source Go service that delivers the right experience to the right entity and monitors the impact. It provides feature flags, experimentation (A/B testing), and dynamic configuration. It has clear swagger REST APIs for flags management and flag evaluation.