Packagist is the main Composer repository. It aggregates public PHP packages installable with Composer.
Pop Loader Component for Pop PHP Framework
Clear fast flexible lightweight php 5.5 framework
The Arcane Project
Webiny Class Loader Component
Sort arrays and objects by multiple fields with unicode characters
Joe's simple to use and versatile PHP autoloader.
Class loader implementation (PSR-0, PSR-4).
Event manager based on reflection, annotations and priority queue
Parallel background jobs controlled from Redis
Single PHP file can autoload all classes and interfaces in your project.
A simple and lightweight PSR-0 and PSR-4 class autoloader
Molajo Resource Services for PHP Applications
Molajo Http: Client, File Upload, Redirect, Request, Response, Server for PHP Applications
A lightish weight PHP5.4 framework. You have no reason to use it, I just got bored so here it is. Plus it helps for quickly rolling out smaller to medium sized sites.
Minimalistic Autoloader, PSR-0 complient.