threePGN
A Fortran implementation of the 3PGN forest growth model, callable from R.
An R package wrapping a Fortran implementation of 3PGN, a process-based forest growth model, so that it can be called from R.
As with rLPJGUESS, the reason for the wrapper is inference: keeping the model fast in Fortran while driving it from R makes the repeated evaluation that Bayesian calibration needs practical.
The package is marked as work in progress and is not on CRAN. Compiling on Windows needs Rtools, because of the C++ and Fortran components.