I’ve worked on several public pieces of software:
obsval() is an R package that aims to make it much easier to calculate predicted effects in R, particularly when using observed covariate values for generalized linear models. It’s based on Hanmer and Kalkan (2013) and is under active development.
gbNgram() is an R package that fetches Google Books Ngrams data, and makes it possible to plot joint frequencies across cognate terms.
Lark is a static site generator written in Python. It can execute Python and R code embedded in posts, even allowing you to shift between languages within a post.