Although I also like to code in Julia and Python, I believe my only worthy collaborations to the world are Stata.
Stata (Mata) routines:
mvologit estimates a Multivariate Ordered Logit model with different order of correlation
elca estimates a wide set of Latent Class models for ordered dependent variables
hmbivpois estimates a (Famoye) Hidden Markov Bivariate Poisson Regression for longitudinal data
rebpoisson estimates a Bivarate Random Effects Poisson model for longitudinal data
hmixlogit estimates a Hybrid Mixed Logit model (for Discrete Choice Experiment)