Yandex offers Disk, a service for storing and sharing files. The Yandex.Disk API enables programmatic access and retrieval of these files from any device connected to the internet. The API can be programmed to be accessed from Mac OSX or iOS applications with the Objective-C SDK, supporting operating systems no earlier than iOS 5 or OSX 10.7.
Box has introduced the Box File Collaboration API, a new API that allows developers to manage access to files in applications. Developers can now control which users can access specific files. The API was created to support a recent update to the Box Notes collaborative note taking application.
Last year Dropbox announced a preview of the new Dropbox API v2. The new version simplified the Dropbox developer experience. In hopes to move toward a more simplified platform, Dropbox also announced deprecation of its Sync and Datastore APIs.