Flysystem - a filesystem abstraction which allows you to swap a local filesystem with a remote one. That could be very useful for assets manipulation system in CMS or something.
I was waiting for it so long :) Videoconverter.js - FFmpeg converted in JavaScript via Emscripten. It works in client browser, really works. It does not support x264 codec yet, but could be useful to create a video preview on client side etc.
Flysystem - a filesystem abstraction which allows you to swap a local filesystem with a remote one. That could be very useful for assets manipulation system in CMS or something.
libphonenumber for PHP - a library for parsing, formatting, storing and validating international phone numbers.
Geocoding PHP library with a huge set of geocoding services abstraction.
Firefox Nightly (version 29) supports CSS variables. Okay, now give native CSS inheritance and I will be happy :)
Antonio Ramirez has shared a guide how to add FontAwesome via Composer in Yii2 project as Asset Bundle.