GRlevel3 is the way to go, the one-time investment of $80 is well worth it. If I'm not on my laptop I look at wunderground radar but its less user friendly and nowhere near GRlevel3 in my opinion. As has been mentioned GRlevel 3 is highly customizable as well. I think you can load GRlevel3 on a few different computers if I'm not mistaken, I just have not done it yet for my desktop. On my phone I use PYKL3 (android) which is great and will get even better with future releases.