• rack-mini-profiler - the Secret Weapon of Ruby and Rails Speed - In-depth guide to using this tool.
• MSLeakHunter - Tools for finding and debugging leaky objects in iOS applications.
• diffoscope - Full featured open source diff utility that can dig into archives.

• Moving Fast With High Code Quality - Tools and processes from Quora's engineering team.
• Why Docker is Not Yet Succeeding Widely in Production and Docker Misconceptions - A pair of cautionary tales that may serve as a counterbalance to some of the uncritical Docker cheerleading out there.
• RubySpec is Reborn! - It's really hard to kill off an open source project, even if you're the maintainer.

• Git 2.5 Release Notes - Everything keeps moving forward. Github has some thoughts on what's significant here as well.
• git-swear-stats - Check your commit messages for signs of anger. Pretty limited vocabulary, though. Perhaps someone can fork and improve.
• Breaking the Ice with Regular Expressions - New course from Code School, free for a limited time.
• Playing with Phoenix Framework – Rails’ younger brother - A Web framework in Elixir.

• GitCompound - New dependency manager with features from git submodules and bundler all in one.
• Proof - "Insanely simple authentication" for use with Rails and various front-end libraries.
• Inch CI - Evaluate the completeness of documentation in your Ruby, JS, and Elixir projects.

• The Hitchhiker's Guide to Modern JavaScript Tooling - Tools to use with ReactJS and the like.
• Using ReactJS with Rails Action Cable - And how to wire some of that code up to your Rails applications.
• Instadocker - 15-minute Docker boxes in 3 seconds on the cloud.

• Build a Minimal Docker Container for Ruby Apps - Working through some of the dependency issues.
• Introducing the Passenger Library Project - Passenger documentation moves from PDF to Hypertext.
• EtreCheck - Quick health checkup for your OS X to get info for troubleshooting.

• Speed Up Your Rails App by 66% - The Complete Guide to Rails Caching - Lots of good info here, though of course YMMV depending on the application.
• Getting started with Rails 5's ActionCable and websockets - I'm starting to feel like I'm too old to learn new tricks. I still haven't the faintest clue WHY I should care about this.
• RMagick - A Year Later - How development on a stalled project got revived.

• Writing Smart Migrations: References, Reversible, and Indexes - A deeper-than-usual look at Rails migrations.
• Kafka: "git branch" for production streams - Introduction to this flexible message broker.
• CodeDorm - Crowdsourced list of sample code projects.

• How Bundler Works: A History of Ruby Dependency Management - How we got to where we are today (which actually works pretty well).
• Antipattern - Community code reviews for the greater good.
• How I upgraded my Ruby with Contracts - More fancy coding to make things work better.

• Colorizer - Flexible online tool for working with colors in a whole mess of formats.
• Airbnb JavaScript Style Guide() { - "A mostly reasonable approach".
• Provision a Complete Rails Server in 2 Minutes with Ansible - So many devops tools, so little time.

/p>

• Protector - Ruby gem with a DSL for field-level security in your models.
• Beyond Upsert - Coming in PostgreSQL 9.5 - A look at some significant new features in the next release.
• Advanced Ruby Hash Techniques - Some useful code and some silliness.

• Endless - iOS Web browser that emphasizes security and privacy.
• Liberation Week - Free replacement screws for those bonehead Apple pentahead things on your iPhone. (Well, for those of you who actually use iPhones).
• iso_latte - Launch ruby code into a subprocess, where it can blow chunks in peace.

• Safari is the new IE - Given that Apple is increasingly the new Microsoft, this is not very surprising.
• gkv - A wrapper for git that turns it into a key-value store. Probably not something you'd want to use in production.
• Docker Cheat Sheet - Lots and lots of good info here.

• UI Testing in Xcode 7 - I really need to look into this, even though I have grown to detest Xcode (and coding for Apple in general, for that matter).
• Opal Playground - Like JSFiddle but with moar ruby.
• Maktoub - Rails engine for newsletter management.

• Squib - Ruby DSL for designing card games.
• Bitnami Container Images for Docker - Now in Beta - Another option for Dockerizing your setup, from an outfit that has long delivered good server images in a variety of formats.
• Atom 1.0 - I don't care to fight the editor wars, but it's always nice to see a new one reach the stable release point.

• Provisioning a Server using Sunzi - A simpler alternative to Puppet or Chef.
• Strategy before details: Keep up with Rails security - A new ebook is coming to help; free until the end of this month.
• Introducing mergeq - Run every build on your CI server, but only merge the successful ones to your deployment branch.

• GitFlow Considered Harmful - An argument against one of the popular ways to use git in a team.
• No Code of Conduct - If your software project simply must have a Code of Conduct, I'd pick this one.
• Pale Moon - A fork of Firefox that's avoiding mass UI and functionality changes in favor of familiarity and customization.

• Patternfly - Bootstrap plus UI Templates to help you implement common web UX patterns.
• A Week with a Rails Security Strategy - Some exercises to help you build good habits as you write your code.
• Own-Mailbox - Home appliance for secure email at a reasonable cost. Looks intriguing, but so far it's vaporware.

• Flocker 1.0: Container Data Management for Docker - Portable data storage for your Docker infrastructure.
• Introducing Empire: A self-hosted PAAS built on Docker & Amazon ECS - Sort of a roll-your-own Heroku.

• Rails 3.2.22, 4.1.11 and 4.2.2 have been released and more - Another pile of security patches that you should install.
• Tales of a Part-time Sysadmin: Dogfooding Docker to test Docker - Containers for CI and other things.