Thinkorswim is free for clients. So is Optionsxpress. Otherwise Hoadley's excel tools are good value for money.
I base all my analysis on the movement of the option' undelying stock (ETF in my case). Optionsxpress has nice charts of the options movement.
Just looking to do what I do with graph paper on a computer screen somehow. You know, plot strike, premium, underlying and then draw diagonal lines? Any software that makes this look cleaner than paper or drawing the chart from scratch in Illustrator or something?