Ruby 2.3.0 released
https://www.ruby-lang.org/en/news/2015/12/25/ruby-2-3-0-released/

What’s New in Ruby 2.3: Interview with Matz
https://blog.heroku.com/archives/2015/12/25/ruby-2-3-0-on-heroku-with-matz

Multiline strings in Ruby 2.3 - the squiggly heredoc
https://infinum.co/the-capsized-eight/articles/multiline-strings-ruby-2-3-0-the-squiggly-heredoc

Inline caching in MRI
http://tenderlovemaking.com/2015/12/23/inline-caching-in-mri.html

How Ruby 2.2 can cause an out-of-memory server crash
https://evilmartians.com/chronicles/ruby-2_2-oom

A Retrospective on Ruby in 2015
http://www.sitepoint.com/a-retrospective-on-ruby-in-2015/

Upgrading to Ruby on Rails 5.0 from Rails 4.2 – application use case
http://dev.mensfeld.pl/2015/12/upgrading-to-ruby-on-rails-5-0-from-rails-4-2-application-use-case/

ApplicationRecord in Rails 5
http://blog.bigbinary.com//2015/12/28/application-record-in-rails-5.html

Introduction to Rails 5 Attributes
http://jakeyesbeck.com/2015/12/20/rails-5-attributes/

Developer Edition 45 – Animations, Memory Tools and More
https://hacks.mozilla.org/2015/12/developer-edition-45-animations-memory-tools-and-more/

WebExtensions in Firefox 45
https://blog.mozilla.org/addons/2015/12/21/webextensions-in-firefox-45-2/

Tree-shaking versus dead code elimination
https://medium.com/@Rich_Harris/tree-shaking-versus-dead-code-elimination-d3765df85c80#.rj1vniaqj

Postgres 9.5 - the Feature Rundown
http://www.craigkerstiens.com/2015/12/27/postgres-9-5-feature-rundown/

How we organize GitHub issues: A simple styleguide for tagging
https://robinpowered.com/blog/best-practice-system-for-organizing-and-tagging-github-issues/