Here are some useful supplementary tools for the course. I will add to this list as the course goes on.
Euclid: The Game — this is a great game for practicing your straight edge and compass constructions
Straightedge and compass tool This is an online tool that lets you do straightedge and compass constructions starting from a blank page
Hilbert’s axioms — a note on Hilbert’s axioms, with commentary
Euclid --- "The Elements", one of the most influential texts of all time