libFAUDES: Software library for discrete event systems. The discrete event systems library libFAUDES implements data structures and algorithms for finite automata and regular languages. The library takes a control theoretic perspective as originally introduced by P.J. Ramadge and W.M. Wonham in the 1980’s. Since then, many researchers have contributed to supervisory control theory, including extensions for hierarchical, modular and decentralized controller synthesis; see [references]. With libFAUDES, we aim for (a) reduced coding effort in the implementation of methods for the control of discrete event systems, and (b) effective advertisement of such methods by making them available to the public.