The Dynawo library is developed and maintained by RTE. It is part of a larger effort to promote both the use of the Modelica language for power system modeling and the advantages of open-source approaches - for more information, go to Dynawo website.
The library is currently maintained in RTE by G.Bureau, Q.Cossart, A. Guironnet, R. Losseau, F. Rosiere and M. Saugier. In case of questions or issues, you can send an e-mail to rte-dynawo@rte-france.com.