Top 5 longitudinal-data open source projects

powerlmm R package for power calculations for two- and three-level longitudinal multilevel/linear mixed models.

An R package for Simulation Investigation for Empirical Network Analysis

R-package for interpretable nonparametric modeling of longitudinal data using additive Gaussian processes. Contains functionality for inferring covariate effects and assessing covariate relevances. Various models can be specified using a convenient formula syntax.

Shiny App for Repeated Measurements Course

R package for fitting joint models to time-to-event data and multivariate longitudinal data