Packagist is the main Composer repository. It aggregates public PHP packages installable with Composer.
PHP implementation of the CloudEvents specificion (https://cloudevents.io/)
Utility for creating GraphQL microservices, which can be combined into a single endpoint through tools like Apollo Gateway
PHP 7.1+ library that generates concise, unambiguous, URL-safe UUIDs
Object wrappers around common used PHP functions.