Filesystem abstraction: Many filesystems, one API.
AWS SDK for PHP - Use Amazon Web Services in your PHP project
Support for authenticating users using both OAuth1.0a and OAuth2 in Symfony2.
A program help you build your own cloud in minutes.
Qiniu Resource (Cloud) Storage SDK for PHP
Jetpack supercharges your self?hosted WordPress site with the awesome cloud power of WordPress.com
PHP Backup utility.
Cloudinary PHP SDK
DigitalOcean API v2 PHP 5.4+ library
Google Cloud Client Library
Be able to backup your database(s) and upload it to the cloud (Dropbox, CloudApp, GoogleDrive, etc.)
Rackspace Cloud Files Streamwrapper for PHP
Provides an object oriented way to programmatically build queries for the Amazon Cloud Search service
Dailymotion Cloud API PHP bindings
Refactored Tropo PHP 5 package
DigitalOcean API PHP 5.3+ library
Endroid Google Cloud Messaging
A PHP wrapper for Stormpath's API
Zencoder integration library for PHP
An Object Oriented wrapper for the Adobe Marketing Cloud APIs
Small library to access Microsoft Windows Azure Blob Storage with a Service or a StreamWrapper.
Integration of Amazon Cloud Search Query Builder library into the symfony2 framework
Qiniu Resource (Cloud) Storage SDK for Laravel 5
Provides implementations to interact with various document storage services
A file uploader with support for validation, image transformation and remote transportation.