ES6 In Depth Articles - High-quality set of explanatory content from Mozilla. Symbols, modules, classes, proxies, let and const, and more, all demystified.
CSS and JS code coverage - The latest drop of Chrome DevTools can help you find stuff that you're downloading but not using.
kubernetes-deploy: If your automated deployment tool needs a scripting front end to help you figure out what happened, it scares me just a bit. Looks useful though.
A Comparison of Docker GUIs - A survey of the current landscape for managing small to medium Docker installs, including a few I hadn't heard about before.
Easymongo, Minimongo, and Mongocore - A variety of Mongo clients in Ruby from the makers of CrowdfundHQ. Pick your own level of syntax and feature support!