TOTGS
TOTGS is an upgraded version of the voronoi technique introduced by Bonadonna and Houghton (2005) for the calculation of the total grain-size distribution of tephra deposits. Refer to the original publication in Bulletin of Volcanology for more details on the technique.
TOTGS is maintained on GitHub and can be cited as Biass, S., Bonadonna, C., (2014), TOTGS: Total grainsize distribution of tephra fallout, https://vhub.org/resources/3297.
User manual
The user manual for TOTGS is available here. Check the blog to see more recent additions.