====== Software ======

===== Circuit Simulation =====

  * LTSpice/SwitcherCAD, Great, free circuit simulation tool - http://www.linear.com/designtools/software/

  * MacSpice - Spice on the Mac http://www.macspice.com/

===== PCB Layout / Schematic Capture =====

  * Eagle - http://cadsoft.de/
    * Very good cross platform support.  Restricted use evaluation version is free.  
  * geda - http://www.gpleda.org/
    * [[http://evilmadscientist.com/|EMSL]] is a big advocate of this tool.  
  * gerbv - http://gerbv.sourceforge.net/
    * Part of the geda suite, incredibly useful for checking your gerbers before sending them out!

===== Land Pattern Design =====
  * PCB Matrix has two tools that are useful for creating land patterns for SMT components (Windows only)
    * LP Viewer, LP Calculator: http://www.pcbmatrix.com/Downloads/LPSoftware.asp