Zoltan is a library of routines for parallel partitioning, load balancing and data management Devine2002,Boman2007a. It is developed by Sandia National Laboratories as an open source library. Zoltan is also available as part of the Trilinos package, again from Sandia National Laboratories. Zoltan gives access to various different partitioning libraries; ParMETIS, PT-Scotch as well as its own graph and hypergraph partitioners Catalyurek2009. Given these features it can be used as a replacement for Sam within the Fluidity code.