Template Model Builder: A General Random Effect Tool Inspired by 'ADMB' R package TMB version 1.9.23 CRAN Task View: Environmetrics (https://CRAN.R-project.org/view=Environmetrics) CRAN Task View: MixedModels (https://CRAN.R-project.org/view=MixedModels) With this tool, a user should be able to quickly implement complex random effect models through simple C++ templates. The package combines 'CppAD' (C++ automatic differentiation), 'Eigen' (templated matrix-vector library) and 'CHOLMOD' (sparse matrix routines available from R) to obtain an efficient implementation of the applied Laplace approximation with exact derivatives. Key features are: Automatic sparseness detection, parallelism through 'BLAS' and parallel user templates. Software Depends: R (>= 3.0.0) Imports: graphics, methods, stats, utils, Matrix (>= 1.0-12) LinkingTo: Matrix, RcppEigen Suggests: numDeriv, parallel Kasper Kristensen <kaskr@dtu.dk> Comprehensive R Archive Network (CRAN) Kasper Kristensen [aut, cre, cph], Brad Bell [cph], Hans Skaug [ctb], Arni Magnusson [ctb], Casper Berg [ctb], Anders Nielsen [ctb], Martin Maechler [ctb], Theo Michelot [ctb], Mollie Brooks [ctb], Alex Forrence [ctb], Christoffer Moesgaard Albertsen [ctb], Cole Monnahan [ctb] GPL-2 2026-07-23 application/tgz https://CRAN.R-project.org/package=TMB doi:10.32614/CRAN.package.TMB