The Erply C# SDK by Erply is available for download fro the official site. It allows API interaction to access inventory, products, customers, webstore, management, documents, and reports. Requests and responses available in HTTP/POST and JSON/XML respectively.
When Yahoo! shut off a stock quote service that developers were relying on -- albeit anonymously -- developers erupted with disappointment and anger. But those developers were probably trespassing on the service and Yahoo! had no way to notify them of the shutdown. Maybe a standard can fix that.
Unleashed, online inventory management software provider, has launched a beta trial for access to its inventory management suite via the Unleashed API. A subset of Unleashed's feature set is currently available through the API. Until the entire feature set becomes available, the API will remain in beta. Unleashed has already improved the beta to include more and more of its entire feature set, and currently includes around 20 of its world class inventory management features.