Awesome
TopoSUB
TopoSUB is a subgrid method that enhances the efficiency of distribute numerical suimulations by several orders of magnitude. It samples the most important aspects of land surface heterogeneity through a lumped scheme, allowing for the application of numerical land surface models (LSMs) over large areas in mountain regions or other heterogeneous environments. Full desciption available in this publication: http://www.geosci-model-dev.net/5/1245/2012/ .
Application
Published here: http://www.the-cryosphere.net/9/411/2015/tc-9-411-2015.html
#Citation Fiddes, J. and Gruber, S.: TopoSUB: a tool for efficient large area numerical modelling in complex topography at sub-grid scales, Geosci. Model Dev., 5, 1245-1257, doi:10.5194/gmd-5-1245-2012, 2012.
License
TopoSUB is licensed under the GNU GPL license, version 3 (or later). Basically, it grants you the rights to use, redistribute and modify TopoSUB. However, if you want to redistribute a modified version of TopoSUB, you must provide the complete source code of your modifications.