Circuit design and simulation software..

AutoTRAX EDA and Kovac Software

From the site:
AutoTRAX EDA delivers to your desktop all of the advanced tools needed to implement today%u2019s complex electronic PCB designs. Mult-sheet schematic entry, circuit simulation, rule driven PCB layout, fast autorouting, 3D visualization and Computer Aided Manufacturing tools.

I hear it is free for students…! Gotta try it..