Here are links to a few open-source resources I've been involved with.

`R`

in an introductory statistics course. (These were subsequently turned into `R`

code for making graphical user interfaces within `R`

.
`Julia`

as a computer supplement while learning calculus. Some `Julia`

packages contributed to for this are `SymPy`

, `ImplicitEquations`

, and `Roots`

.