In this chapter we review the currently available corpora to study anaphoric interpretation, and the tools that can be used to create new ones. A comprehensive survey of annotated corpora will be given, which ranges from the corpora and guidelines developed for the Message Understanding Conferences MUC-6 (1996) and MUC-7 (1998), which have been seminal to the field, to the resources that have been recently made available as part of the 2010 SemEval evaluation campaign. All fundamental design decisions regarding annotation formats and standards are described, and the relevant properties of the corpora are presented in a uniform and well-structured way. Moreover, three useful, widely used and freely available annotation tools (CALLISTO, MMAX2, and Palinka) will be described. They can be employed if own annotation work turns out to be indispensable.