Guzzle is a PHP HTTP client library
Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs
Guzzle is a PHP HTTP client library and framework for building RESTful web service clients
The most popular PHP library for use with the Twitter OAuth REST API.
REST Server for the CodeIgniter framework
Access your WordPress site's data through an easy-to-use HTTP REST API.
PHP HTTP client. This library is deprecated in favor of https://packagist.org/packages/guzzlehttp/guzzle
This Bundle provides various tools to rapidly develop RESTful API's with Symfony
Handle the output of complex data structures ready for API output.
Generates documentation for your REST API from annotations
A Readable, Chainable, REST friendly, PHP HTTP Client
PHP Curl Class makes it easy to send HTTP requests and integrate with web APIs.
Swagger-PHP - Generate interactive documentation for your RESTful API using phpdoc annotations
PayPal's PHP SDK for REST APIs
Restler is a simple and effective multi-format Web API Server framework written in PHP. Just deal with your business logic in php, Restler will take care of the REST!
Payum offers everything you need to work with payments. From simplest use cases to very advanced ones.
A standalone Amazon S3 (REST) client for PHP 5.2.x using CURL that does not require PEAR.
A PHP library to support implementing representations for HATEOAS REST web services
A Slim Framework skeleton application for rapid development
The RESTful Web App PHP Micro-Framework
Thin controller for RESTful applications
Wrapper for the Neo4j graph database REST interface
PHP 5.3 SDK for the Dropbox REST API
Library for interacting with the Pusher REST API