Re: PCB Design
Powerful is a very general term in CAD tools.
Autorouting usually require the designer to preset physical constraints and choice of routing algorithms, adjust the default recommended settings, alter the design rules and routing guidelines etc.
Powerful in many cases depend alot on how you set the conditions for autorouting.
Powerful ones in the market vary from individual, some might prefer Cadence Allegro, some might prefer HP MentorGraphics, some might prefer Protel 99 SE or DXP, some might prefer PADS (formerly Power PCB), some might prefer Eagle and so on... All these mentioned are popular ones used in the industry.
Powerful depends on the kind of PCB, the kind and number of components to connect, the density of netlist, the routing algorithms available etc.