Below a made a list of links to root related simulation models and modelers. I don't claim the list to be exhaustive and would be very pleased if visitors would suggest other links.
Architectural Root Models
ROOTMAP, Australian, Art Diggle, Vanessa Dunbabin, Robert van Hugten
RootTyp, French, Claude Doussan, Loïc Pagès, this group published many papers and wrote several models.
Root Module in Hydrus 3d, USA, Jan Hopmans, Jirka Šimunek
Crop Models
DSSAT, Gerrit Hoogenboomd many others
Other Modeling References
Simulation models database: "Modelbase System: A Distributed Model Database on The Internet"
