Software tools can provide valuable support for many aspects of systematic reviews and mapping studies. As we have seen in previous chapters, conducting a review involves the systematic storage, management, validation and analysis of what can be quite large quantities of data. Many of these review activities are error prone and time consuming when performed manually. The software systems that have been used to support systematic reviews and mapping studies in software engineering include basic productivity tools, such as word processors and spreadsheets, reference managers, statistics packages and purpose-built tools targeting either particular stages of a review or the review process as a whole.