CCP-FEL: a collection of computer programs for free-electron laser research.

The latest virtual special issue of Journal of Applied Crystallography () collects software for free-electron laser research and presents tools for a range of topics such as simulation of experiments, online monitoring of data collection, selection of hits, diagnostics of data quality, data management, data analysis and structure determination for both nanocrystallography and single-particle diffractive imaging. This article provides an introduction to the special issue. [ABSTRACT FROM AUTHOR]