Magento API Client is a PHP client library for the Magento SOAP API v2. It supports the Mage_Catalog, Mage_CatalogInventory, Mage_Checkout, Mage_Customer, Mage_Directory, Mage_Sales, Enterprise_CustomerBalance, Enterprise_CustomerGiftCard, Mage_GiftMessage, Mage_Core, and Store_View modules. The library uses namespaces and is based on composer tools.
Ripcord is an PHP 5 XML-RPC server and client library with a very simple and easy to use API. You can create XML-RPC, (simplified) SOAP 1.1, and SimpleRPC clients with one call and then call RPC methods as if they were local methods of the client. You can create a server with one call, passing it any number of objects or classes whose methods it will publish and automatically document.
iSfinx is a Web services based prototype of the Sfinx PIM. Sfinx is a personal knowledge and data manager which can manage your private data like contacts, events, notes, files, tasks, know-how, etc. Each data item is structured with abstract "slices", which are organized with a category hierarchy that you can define for your own needs. Every data item must be connected to some Sfinx object. Events can be connected to contacts, contacts to tasks, tasks to data sources, know-how, or notes, and so on. You can freely edit, delete, or reconnect them. Additional tags, which can be slices or other Sfinx objects, can also be attached to items, so any data you enter to Sfinx can be cross-connected with any other data or abstract category. A search engine helps you to navigate in this information ocean.