Just a keyboard for science notes on a Mac. Option gets you to most of the lower-case Greek alphabet. Shift-option gets you to some of the Greek uppercase, and some other stuff.
Install to "~/Library/Keyboard Layouts" and then open "Keyboard Preferences/Input Sources" and it should be listed under "Others" or you can click the "+" button and search for "Science".
You can also install to "/Library/Keyboard Layouts" but you may need to reboot to get it to show. The nice thing is it will then also be available for system functions, like login.
Made with Ukelele (https://software.sil.org/ukelele/).