Guzzle By: Michael Dowling
Free MIT

Guzzle is a PHP HTTP client that makes it easy to send HTTP requests and trivial to integrate with web services. Simple interface for building query strings, POST requests, streaming large uploads, streaming large downloads, using HTTP cookies, uploading JSON data, etc... Uses PSR-7 interfaces for requests, responses, and streams. Can send both synchronous and asynchronous requests using the same interface.