Cirilo is a java application developed for content preservation and data curation in fedora-based repository systems. Fedora [http://fedora-commons.org/] (Flexible Extensible Digital Object Repository Architecture) is an infrastructure dedicated to the persistent archival and management of resources considered to be worthy of long-term preservation. Content preservation and data curation in our sense include object creation and management, versioning, normalization and standards, and the choice of data formats. The client offers functionalities which are especially prone to be used as tools for mass operations on Fedora objects, thus complementing Fedora's inbuilt Admin Client. Cirilo operates on Fedora's management-API (API-M) and uses a collection of predefined content models. These content models can be used without further adjustments for standard workflow scenarios like the management of collections of TEI objects. Content models in the sense of Fedora are class definitions; On the one hand they define the (MIME-)type of the contained datastreams, on the other hand they designate dissemination methods operating on these datastreams. Every object in the repository is an instance of one of these class definitions.