The line between what constitutes a platform versus an application is getting more blurry with each passing day. Applications are increasingly coming complete with SDKs that provide developers with access to APIs through which they can extend the application. Case in point is Decisyon, which recently launched a Decisyon 360 collaborative decision making (CDM) environment that makes extensive use of RESTful APIs and Web Services that are exposed via an SDK.
Postman REST Client, a powerful HTTP client that helps developers test and develop web services, has just released version 0.9.3. (Google Chrome Packaged App) which includes brand new features including OAuth 2.0 support, user accounts, bulk uploading/importing, and a brand new API Directory.