Utilities We offer several utilities to assist in setting up your Cobalt simulations. For more information regarding our utilities, please contact us. blacksmith Blacksmith is a grid management utility containing converters and grid manipulation routines. ligase Ligase is a pre-processing GUI used to create and/or modify input files for Cobalt. goh GOH is a stand-alone grid assembly code that can be used to test your grid system prior to running Cobalt and the Overset module.