The P-Model and BiomeE Modelling Framework R package rsofun version 5.1.0 Implements the Simulating Optimal FUNctioning framework for site-scale simulations of ecosystem processes, including model calibration. It contains 'Fortran 90' modules for the P-model (Stocker et al. (2020) <doi:10.5194/gmd-13-1545-2020>), SPLASH (Davis et al. (2017) <doi:10.5194/gmd-10-689-2017>) and BiomeE (Weng et al. (2015) <doi:10.5194/bg-12-2655-2015>). Software Depends: R (>= 4.1.0) Imports: dplyr, purrr, tidyr, magrittr, GenSA, BayesianTools, lubridate, multidplyr, stats, utils Suggests: covr, constructive, cowplot, rcmdcheck, testthat (>= 3.0.0), rmarkdown, ggplot2, knitr, sensitivity, rpmodel, rlang Benjamin Stocker <benjamin.stocker@gmail.com> Comprehensive R Archive Network (CRAN) Benjamin Stocker [aut, cre] (ORCID: <https://orcid.org/0000-0003-2697-9096>), Koen Hufkens [aut] (ORCID: <https://orcid.org/0000-0002-5070-8109>), Josefa Arán Paredes [aut] (ORCID: <https://orcid.org/0009-0006-7176-2311>), Laura Marqués [ctb] (ORCID: <https://orcid.org/0000-0002-3593-5557>), Mayeul Marcadella [ctb] (ORCID: <https://orcid.org/0000-0001-8555-3808>), Ensheng Weng [ctb] (ORCID: <https://orcid.org/0000-0002-1858-4847>), Fabian Bernhard [aut] (ORCID: <https://orcid.org/0000-0003-0338-0961>), Geocomputation and Earth Observation, University of Bern [cph, fnd] GPL-3 2025-10-09 application/tgz https://CRAN.R-project.org/package=rsofun doi:10.32614/CRAN.package.rsofun