This program was developed to help students better understand the connections between Bode, Nyquist, Nichols, Gain, Root Locus, and Time Response plots. This includes straight-line approximations and even steps necessary to constructing a root locus. It does all this in a somewhat user-friendly GUI. As user-friendly as I could make it with the limited time I had to develop it. :) Enjoy!!
And there is complete Help via the Help menu item.