Integrations

Integration with Relay
Integration with Laravel 5 + Relay Helpers for Laravel + Nuwave Lighthouse
Symfony Bundle by Overblog
Out of the box integration with any PSR-7 compatible framework (like Slim or Zend Expressive) via Standard Server

GraphQL PHP Tools

Define types with Doctrine ORM annotations (for PHP7.1, for earlier PHP versions)
DataLoader PHP - as a ready implementation for deferred resolvers
PSR 15 compliant middleware for the Standard Server (experimental)
GraphQL Uploads for the Standard Server
GraphQL Batch Processor - Simple library that provides a builder interface for defining collection, querying, filtering, and post-processing logic of batched data fetches.

General GraphQL Tools

GraphiQL - An in-browser IDE for exploring GraphQL
ChromeiQL or GraphiQL Feen - GraphiQL as Google Chrome extension