I am a new member to the full GT group and love my lessons on GT.
This is a good interactive fretboard site which covers the notes, triads, scales, modes ,intervals in any key
If you scroll down on this site, you can watch the video of how to get best use of this interactive fretboard.
Say hello to me on Introduction forum or here.
It covers other tunings including Drop D, and other alternative tunings, even other instruments like bass guitar, mandolin, ukulele