So far I think the best ressource for Z-scale trackplans is David K Smiths Gallery on his website. I think there are many interesting trackplans out there, but they are mostly in other scales, so I've taken the liberty to convert so far two known trakplans in other scales to Z-scale. The first is Ed Lynch Milwaukee Railroad in Montana and the second is counting from the top Mike Fischers plan no. 42 on his website http://www.cke1st.com/m_train2.htm Hopeing that this gives them the credit they desserve for it, I show you here what I've been doing with them in Z. (All Rokuhan-track) I'm gonna do more like this in near future.
I downloaded Anyrail and found it to work quite well. All the major Z scale track is supported. The best thing is it's free!
Heck with all the track out there why not buy some and play? heck, eventually you'll find something neat.
Yes it's free, but I think you are limited to using only 50 pieces. I made my drawings with Scarm, and I find it very easy to use.