CoREAS v1.1 is now available as an integral part of CORSIKA 7.5.

New features with respect to CoREAS v1.0 are the ability to run in fully parallelized mode on MPI-enabled clusters as well as various ways to slice simulations (e.g., only calculate the signals contributed by particles in a certain energy or atmospheric depth range).

Please visit the CORSIKA webpage and download the code directly from there.

Information on how to use CoREAS is available from the CoREAS user's manual. Also, please check out this article with information on radio emission simulations with CoREAS.