Site for Scales
Personally speaking, I love practicing scales.
This not only really assist with soloing, it also assist with over all control over the instrument and inspiration for new songs. I just found a website where you can put in any scale, name, and any other classification you can think of, including the modal varients of the scale, 12 note wheel, and tonnetz diagram.
I'm not connected to this in anyway, and it's not an advertisement. I just plan on using this alot, and I believe someone else would be interested.