Packagist is the main Composer repository. It aggregates public PHP packages installable with Composer.
SlimPHP + Doctrine2 ORM + PHP DI + JSON API skeleton for building REST API's.
JSON API implementation, by annotations or schemas.
JSON RPC 2.0 implementation
Czech MKN database
Rich expression builder allows create complex closure expression tree to filter array of objects
Personal library of tools for PHP
Abandoned! See symfony/string