A system for providing services to subscribers of a network supports the provision of a plurality of different services to multiple subscribers. Multiple processing units are provided, each providing a respective execution environment for a respective set of software applications. A data structure is provided containing data identifying the sets of software applications or software application components of the sets of software applications, and different developers are provided with different access rights to the data in the data structure. Different software applications or software application components are associated with different access right levels. This provides a software development environment in which a common services repository is provided with different access rights implemented for accessing the repository.