Guzzle, an extensible PHP HTTP client
HTTPlug, the HTTP client abstraction for PHP
Common HTTP Client implementations and tools for HTTPlug
Simple handler system used to power clients and servers in PHP (this project is no longer used in Guzzle 6+)
PHP Curl Class makes it easy to send HTTP requests and integrate with web APIs
A Chainable, REST Friendly, PHP HTTP Client. A sane alternative to cURL.
Requests for PHP is a humble HTTP request library. It simplifies how you interact with other sites and takes away all your worries.