A PHP framework for web artisans
File Upload widget with multiple file selection, drag&drop support, progress bar, validation and preview images, audio and video for jQuery. Supports cross-domain, chunked and resumable file uploads. Works with any server-side platform (Google App Engine, PHP, Python, Ruby on Rails, Java, etc.) that supports standard HTML form file uploads.
The Symfony PHP framework
The PHP Unit Testing framework.
Laravel Debugbar (Integrates PHP Debug Bar)
Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs.
Mobile_Detect is a lightweight PHP class for detecting mobile devices (including tablets). It uses the User-Agent string combined with specific HTTP headers to detect the mobile environment.
It is probably the best SDK in the world for developing WeChat App.