On behalf of Rich Dlin here at the University of Waterloo, I want to keep these resources alive. Rich has some incredible Geogebra applications that you might want to consider using in a first or second year calculus course.
He can be reached at firstname.lastname@example.org if you have further questions.
I will try to keep an up to date link here:
but I’ll also include an attachment (if it fits/works) as well.