Trying something different, maybe a monthly summary instead of a weekly one...

Programming

Katas

Corey Haines on fast rails tests: http://www.confreaks.com/videos/641-gogaruco2011-fast-rails-tests
Exceptional Ruby: Master the Art of Handling Failure in Ruby, by Avdi Grimm: http://pragprog.com/book/ager/exceptional-ruby
Metaprogramming Ruby: Program Like the Ruby Pros: http://pragprog.com/book/ppmetr/metaprogramming-ruby
Simulating the World with Ruby - Bryan Liles - Madison Ruby 2012: http://confreaks.com/videos/1088-madisonruby2012-simulating-the-world-with-ruby
Spinach is a BDD framework on top of Gherkin: https://github.com/codegram/spinach
rspec-given, Given/When/Then keywords for RSpec specifications: https://github.com/jimweirich/rspec-given
Garelic: use Google Analytics for Rails App Performance Monitoring.: https://github.com/jsuchal/garelic
Jeweler, opinionated tool for creating and managing Rubygem projects: https://github.com/technicalpickles/jeweler
Better Specs tries to collect most of the "best practices" for RSpec: http://betterspecs.org/
Yell - Your Extensible Logging Library is a comprehensive logging replacement for Ruby: https://github.com/rudionrails/yell

Xtend is a little language that compiles into idiomatic Java source code: http://www.eclipse.org/xtend/
Introducing restfuse – a JUnit Extension to test REST APIs « EclipseSource Blog: http://eclipsesource.com/blogs/2011/11/14/introducing-restfuse-a-junit-extension-to-test-rest-apis/
WYTIWYR : What You Test Is What You Run « Antonio's Blog: http://agoncal.wordpress.com/2012/01/16/wytiwyr-what-you-test-is-what-you-run/
Metrics. Capturing JVM- and application-level metrics: https://github.com/codahale/metrics
Dagger, a fast dependency injector for Android and Java: https://github.com/square/Dagger
LittleProxy is a high-performance HTTP proxy written in Java: http://www.littleshoot.org/littleproxy/

JavaScript InfoVis Toolkit - Create Interactive Data Visualizations for the Web: http://philogb.github.com/jit/index.html
r2d3. Raphael Rendered, Data Driven Documents: https://github.com/mhemesath/r2d3/
BonsaiJS, a lightweight graphics library with an intuitive graphics API and an SVG renderer: http://bonsaijs.org/
Lazy web workers only work when someone is watching - in the UI thread!: https://github.com/bgrohman/lazy-worker
Doctest.js is a test runner and testing framework for Javascript: http://doctestjs.org/
A lightweight library that provides tools for organizing asynchronous code: https://github.com/tildeio/rsvp.js
scxml-viz, a d3-based library for visualizing SCXML with SVG: https://github.com/jbeard4/scxml-viz
Bifocals: a node.js View library with support for asynchronous sub-views (aka partials) and interchangeable rendering systems: http://bifocalsjs.com/

Module of algorithms for Python: https://github.com/nryoung/algorithms
PythonBooks - Learn Python the easy way !: http://pythonbooks.revolunet.com/
Celery is an asynchronous task queue/job queue based on distributed message passing: http://celeryproject.org/

The Haskell Cabal (Common Architecture for Building Applications and Libraries): http://www.haskell.org/cabal/

Repository for Source Code Pro Font, from Adobe: https://github.com/adobe/Source-Code-Pro

Dandelion, incremental Git repository deployment. : https://github.com/scttnlsn/dandelion

Tasseo, live dashboard for Graphite: https://github.com/obfuscurity/tasseo
Confab, configuration management with Fabric and Jinja: https://github.com/locationlabs/confab
Sensu, a monitoring framework that aims to be simple, malleable, and scalable.: https://github.com/sensu/sensu
Watch and Learn: PuppetConf 2012 videos: http://puppetlabs.com/blog/watch-and-learn-puppetconf-2012-videos/
Optional scripts for hubot: https://github.com/github/hubot-scripts
IEvms, automated installation of the Microsoft IE App Compat virtual machines: https://github.com/xdissent/ievms
Vmfest - manage your local VMs from the repl: https://github.com/tbatchelli/vmfest
FITB is a tool that automatically polls every port on a list of switches you give it. Simple configuration, precise polling, easy searching and automatic discovery of both new ports and ports that go offline are the goals of FITB: https://github.com/lozzd/FITB
Pencil, a Graphite dashboard system: https://github.com/fetep/pencil

SABnzbd is an Open Source Binary Newsreader: http://sabnzbd.org/
Easily find all nzb files posted on the newsgroups: http://www.nzb-rss.com/
Syte:A really simple but powerful packaged personal site that has social integrations like twitter, github, dribbble, instagram, foursquare, tumblr, wordpress, last.fm, and much more... https://github.com/rigoneri/syte
F1 live timing map, interesting experiment: http://labs.lusob.com/f1mapp/
f.lux for Linux (f.lux makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day): http://stereopsis.com/flux/linux.html
Circular, an open source Buffer app. Stock up some great tweets and have them automatically shared throughout the day.: http://circular.io/
Deployd - Design, build, and scale APIs for web and mobile apps in minutes instead of days: http://deployd.com/
DocBlockr is a Sublime Text 2 package which makes writing documentation a breeze. DocBlockr supports Javascript, PHP, ActionScript, CoffeeScript, Java, Objective C, C and C++.: https://github.com/spadgos/sublime-jsdocs