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Some free/open tools for hobbies

[Open source PCB routing] MUCS-PCB - The University of Manchester School Of Computer Science PCB design software
http://intranet.cs.man.ac.uk/apt/projects/tools/mucs-pcb/

Ladder Logic for PIC and AVR
http://www.cq.cx/ladder.pl

SketchFlat: 2d CAD, with Constraints
http://www.cq.cx/sketchflat.pl

SOLVESPACE -- parametric 3d CAD
http://solvespace.com/index.pl

And for autorouting on kicad, there is the closed source freerouting
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