pad2pad appears to be trying to compete with ExpressCPB.
Their software has a lot more features and the boards have more options.
Unfortunately (1) the software is very buggy when run under XP (2) it doesn't work at all under wine
We know that all well written windows programs will work under wine[1] so it must not be a well written program.
[1] See LTspice for an example.We can expect ExpressPCB to react to this so we can expect them to add ratsnest and some sort of DRC.
For prototypes autoroute isn't all that needed.