Packagist is the main Composer repository. It aggregates public PHP packages installable with Composer.
This bundle includes some of the typical stuff the author needs for his projects, like a user object, generic REST stuff and the context system.
Bundle for simple access to (mainly) nosql databases for Symfony
A very simple, but flexible, service based reports generator/viewer
Bundle for simple access to the REST API of Sugar CRM 7 and up.