Abstract: Systems and methods are provided for collaborative mobile device applications. Mobile device applications for a mobile device are stored in a database. The mobile device applications include an interface defining how each mobile device application interacts with the other mobile device applications. Each mobile device application provides a set of services and/or features for a virtual application, wherein the virtual application is defined by the mobile device applications and their associated interfaces. The mobile device applications are configured such that a mobile device can download at least two different subsets of the mobile device applications, wherein each subset provides different functionality for the virtual application.

Abstract: Systems and methods are provided for associating structured tags with files in a computer system. In one method, the method includes requesting a user, by the computer system, to provide the structured tag for the file, where the structured tag includes a tag type, a value type, and a tag value. The method can further include receiving the structured tag from the user, associating the structured tag and the file, and storing the association of the structured tag and the file in a non-transitory storage medium.