Here are some of the (more developed) R Packages that I’ve had the pleasure of working on:

{shinysurveys} provides easy-to-use, minimalistic code for creating and deploying surveys in Shiny.

{ghee} is a user-friendly wrapper for the {gh} package that provides a flexible API interface for GitHub.

{discord} provides functions for discordant kinship modeling and other sibling-based quasi-experimental designs. It has highly customizable, efficient code for generating genetically-informed simulations and provides user-friendly functions to perform discordant-kinship regressions.

{BGmisc} provides functions useful for behavior genetics, including plots and classic formulae.