Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

A powerful Android chart view / graph view library, supporting line- bar- pie- radar- and candlestick charts as well as scaling, dragging and animations.

[http://forums.orionjs.org] Orion is a simple and powerful CMS for meteor that allows you to build simple or complex websites with powerful admin panels in minutes.

This room has moved: https://gitter.im/typelevel/spire

The Most Powerful Swipe Layout!

The minimalistic but powerful, modular, functional reactive programming library in JavaScript.

ComfortableMexicanSofa is a powerful Rails 5 CMS Engine

Ufront is a powerful MVC web framework for Haxe. It gives you quick development, shared code on the client and server, powerful extensibility, easy testing, and targets PHP or Neko. This is the mothership repo - most of the actual code is contained in the other ufront repos, such as ufront-mvc.

A powerful C# library for Razer Chroma's SDK

Lightweight and powerful data binding + templating solution

terse, modular & powerful css library

The most flexible and powerful way to build a form on iOS

Powerful Tree Editor

Typo is the oldest and most powerful Ruby on Rails blogware, providing custom templates, powerful drag and drop plugins API, advanced SEO capabilities, XMLRPC API and many more.

WP Awesome Support is a simple yet powerful ticketing plugin for WordPress.

A powerful templating engine with inheritance, asynchronous control, and more (jinja2 inspired)

A powerful library for creating notifications in android platform.

A Scope & Engine based, clean, powerful, customizable and sophisticated paginator for Rails 3 and 4

c:geo - The powerful Android geocaching app.

PrototypeJS based Sleek, intuitive, and powerful front-end framework for faster and easier web development.

A powerful, extensible, flexible, cross-browser rich text editor

Cerebellum.js is a powerful set of tools that help you structure your isomorphic apps, just add your preferred view engine.

A simple, quick, powerful web framework

qTip2 - Pretty powerful tooltips

CuraEngine is a powerful, fast and robust engine for processing 3D models into 3D printing instruction for Ultimaker and other GCode based 3D printers. It is part of the larger open source project called "Cura".

Simple, flexible and powerful Model-View binding for Backbone.

Code coverage for Ruby 1.9+ with a powerful configuration library and automatic merging of coverage across test suites

SEOstats is a powerful open source PHP library to request a bunch of SEO relevant metrics.

A Powerful, Elegant and Robust Calculator App

XFramework, or XF, is a small but powerful HTML5 JavaScript framework for building truly cross-platform web applications that will work on mobile phones, tablets, desktop computers, and even Smart TVs.

Powerful and Performant Proxy

Karabiner (KeyRemap4MacBook) is a powerful utility for keyboard customization.

Mongorilla is a simple, clean, and powerful NodeJS based content moderator for MongoDB.

SBuild - The magic-free yet powerful build tool.

Easy, powerful and ultrafast MongoDB ODM for Laravel.

A powerful yet easy-to-use PHP micro-framework designed to help you build dynamic and robust Web applications - fast!

Simple, extensible and powerful one stop personal assistant

Powerful, light, feature-rich C library

Powerful data generator tool.

A powerful, scalable PHP5 application framework that follows the MVC paradigm

Free and Powerful CSS/JS Framework

Maxmertkit, powerful, most customizable and easiest for usage mobile first front-end framework for web-development.

The simple, lightweight and yet powerful PHP framework

Manage permissions on Doctrine entities

Sideshow is a powerful javascript library which aims to reduce your user's learning curve by providing a way to create step-by-step interactive tours. Explain the features of your application, control your end-user's interaction with your UI, emphasize what you're explaining in each step by masking it. Just think! The sky is the limit!

A powerful open source data warehouse system

A powerful, easy to use heuristic search library implemented in pure java for solving Artificial Intelligence problems.

a simple but powerful cms library for node

Sleek, intuitive, and powerful front-end framework for faster and easier web development.

Apify is a small and powerful open source library that delivers new levels of developer productivity by simplifying the creation of RESTful architectures. It helps development teams deliver quality web services and applications in reduced amounts of time. If you are familiar with the Zend Framework, then you already know how to use Apify.