Packagist is the main Composer repository. It aggregates public PHP packages installable with Composer.
Client library for Google APIs
Client library for Google APIs private use only
AWS SDK for PHP - Use Amazon Web Services in your PHP project private use only
CRON for PHP: Calculate the next or previous run date and determine if a CRON expression is due
Dropbox PHP API V2 SDK for private use only
PHP SDK for Rackspace APIs