• Sinatra Cookbook - New ebook of Sinatra recipes. $25 to purchase.
• Easy MySQL With Docker - Container for throwaway demo databases.
• Ruby 2.2.0-preview1 Released - The upgrade cycle never ends. You'll be needing this for Rails 5.0.

• Picnic CSS - Lightweight CSS3/Semantic HTML framework.
• SweetLogger - Rails Logger replacement that places nicely in a multi-threaded environment.
• Rails 4.2 Overview, Part 1 of 2 - Touching on major features, in this case Active Job, Deliver Later, and GlobalID.

• Firefox Add-on Enables Web Development Across Browsers and Devices - Experimental way to debug Chrome on Android and Safari on iOS from the comfort of your desktop Firefox environment.
• Oga: a new XML/HTML parser for Ruby - An attempt to replace Nokogiri with a new contender.
• Rails 4.1.6 and 4.0.10 have been released - And remember, 4.0 will be retiring soon.

• Using NSEnter with Boot2Docker - How to safely poke around inside running Docker containers.
• Configuring Rails Environments - An approach using environment variables instead of config files.
• weave - A virtual network to connect Docker containers across multiple hosts.
• Nomad - A selection of command line utilities to help with iOS development.

• Rails 4.1.6.rc2 and 4.0.10.rc2 have been released! - And the final versions should be out this week.
• CommonMark - An attempt at a rigorous Markdown spec that immediately got mired in politics.
• blackbox - Support for encrypting secrets via GPG at rest in your git or Mercurial repos.
• Bringing new security features to Docker - Some things you can do to harden Docker containers.

• Kitematic - OS/X GUI for Docker management.
• factory_girl-preload - Define your test data using factories, but then preload them once like fixtures.
• Service objects in Rails will help you design clean and maintainable code. Here's how. - Another take on objectizing your Rails applications.

• Docker Do's And Don'ts - Become one with the Docker.
• How to Use Docker on OS X: The Missing Guide - The basic concepts, how boot2docker works, and getting around some common issues.
• curl.io - Temporary file sharing from your terminal to anywhere on the internet.

• ZeroTier - Create your own virtual switched network out of peer-to-peer connections.
• Mirah - Where Java Meets Ruby - An attempt to build a less enterprisey version of Java while maintaining the benefits of the JVM.
• Draft chapters of the Ruby on Rails Tutorial (3rd Ed.) - This has become one of the best introductions to Rails and web development out there.
• Rack Metrics is dead, long live Rack Metrics - Performance monitoring tool for Rack, newly open sourced.

• PutsReq - Tool for recording HTTP requests and simulating responses.
• slap - Sublime Text clone for terminal editing. Sort of.
• Paperdragon: Explicit Image Processing - Alternative to Paperclip and Carrierwave with Dragonfly under the hood.

• web-console - The readme for one of the new features coming down the pike in Rails 4.2.
• GITenberg - Project Gutenberg meets GitHub.
• The Lesser-known Features in Rails 4.2 - Some things you might not have noticed yet.

• Vedeu - Ruby terminal application framework for OS X that doesn't depend on ncurses.
• Fearless Rails Deployment - New ebook that covers stuff like Vagrant, RVM, Capistrano, Chef, and Unicorn.
• Ruby 1.9.2-p330 Released - A final release of the 1.9.2 series to fix a critical security bug.

• Time to get hacking - Introducing Rec Room - A node.js based framework for Web applications from Mozilla.
• Lime Text - Open source clone of Sublime Text built in Go.
• Rails 4.2.0 beta1: Active Job, Deliver Later, Adequate Record, Web Console - The next version is nearly here.

• The Complete iOS 7 Course - Used to be $499, now free. Of course they'd still like to sell you an iOS 8/Swift course.
• scraperjs - A Javascript web scraper.
• Rails 4.0.9 and 4.1.5 have been released! - With a security fix that you only need to worry about if you're using Active Record's create_with.

• Epic Privacy Browser - Chromium-based browser that tries to stop web sites from tracking you, ever.
• RMagick - A fork that seems to be getting traction in trying to sort out the mess that RMagick development has become.
• Better Browsing for Ruby Developers - Omniref has released plugins for Firefox and Chrome.

• Guacamole - "Clientless remote desktop gateway" supporting VNC and RDP via HTML5.
• Pico - A "stupidly simple & blazing fast, flat file CMS" for those easy web sites using Markdown & some meta formatting.
• CSS at Plataformatec - How one consultancy organizes CSS in their Rails projects.

Why yes, I am taking a look at Docker lately. Always something new to learn...

• Quay - "Secure hosting for private Docker repositories".
• Tutum - Another host for Docker containers.
• A Rails Development Environment with Docker and Vagrant - Detailed step-by-step setup instructions.

• How to keep track of Rails rake tasks - That is, of tasks that you need everyone on your team to run. See also the migrake gem.
• Rails Degenerate Front-End Support - A plea for Rails to lead the way to better Javascript integration.
• Roda - Oh look, a new Ruby web framework. This one is designed for simple apps that can use a routing tree to good advantage.
• Browse GitHub code like you're in an IDE, with the SourceGraph Chrome extension - The title says it all.

• How to keep track of Rails rake tasks - That is, of tasks that you need everyone on your team to run. See also the migrake gem.
• Rails Degenerate Front-End Support - A plea for Rails to lead the way to better Javascript integration.
• Roda - Oh look, a new Ruby web framework. This one is designed for simple apps that can use a routing tree to good advantage.
• Browse GitHub code like you're in an IDE, with the SourceGraph Chrome extension - The title says it all.

• MooseX - A New Ruby DSL - Declarative object oriented programming for Ruby, ported from Perl.
• The Legal Stuff - RubyGems is (as always) looking for more help. If you depend on all the volunteers to keep your code running your really ought to think about giving back.
• gritter - Add Growl-like notifications to your Rails application using jQuery's 'gritter' plugin.
• overv.io - A pretty face and more tools on top of GitHub issues to make project management easier.
• Time to Bring Back Fixtures - Why and how to consider replacing factories in your Rails projects.

• Write maintainable JavaScript/CoffeeScript in Rails - Some tips on organizing the usual mess.
• Representable 2.0 With Better Inheritance, Filters and Automatic Collections - An upgrade to a chunk of some alternative ways to use Rails.
• Rackspace developer+ Program - A way to get started on Rackspace with a generous monthly credit.
• transit-rails - An easy way to use the Transit format for conveying values between applications from Rails.
• Chef Zero - In-memory Chef server to test out your chef client stuff.