InstantClick - is a JavaScript library that dramatically speeds up your website, making navigation effectively instant in most cases.
PsySH - a runtime developer console, interactive debugger and REPL for PHP. Looks like the coolest dev tool after xDebug. But could not run debug correctly on basic Vagrant+Apache due to missing $HOME env param.
InstantClick - is a JavaScript library that dramatically speeds up your website, making navigation effectively instant in most cases.
SharingButtons - super fast and easy Social Media Sharing Buttons. No JavaScript. No tracking.
Ansistrano- ansistrano.deploy and ansistrano.rollback are Ansible Galaxy roles to easily manage the deployment process for scripting applications such as PHP, Python and Ruby. It's an Ansible port for Capistrano.
ScrollTrigger - JavaScript lib to add scroll based animations to the site with ease.
Learn Enough Command Line to Be Dangerous by Michael Hartl an introduction to the Unix command line. Brief and really informative.