Sysdig - open source, system-level exploration: capture system state and activity from a running Linux instance, then save, filter and analyze. Kind of strace + tcpdump + lsof + awesome sauce. With a little Lua cherry on top.
Note
Matter.js - 2D physics engine for HTML5 mobile and web applications. Has a great demos
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at MobiDev (Kharkiv, Ukraine)
Code in Ruby and Elixir, but still love PHP. Explore ES6 and Vue.js. Explore databases, use Ubuntu and MacOS, think about IT people and management
Notes
LetsEncrypt.org promises till Summer 2015 to provide free Certification Autority to make https for our sites just as with a magic wand. That will be awesome :)
Vivus - JavaScript library to make drawing animation on SVG
Google's Material Design like CSS frameworks
Factory Muffin - library for creating and populating objects (with Faker) on-the-fly in tests. Also could be used with ORM to poluplate DB objects.