As I was passing by on the web I noticed that no Calculix review had been received.  I couldn't pass through without correcting the situation.  I consider the program to be a real gem. I will be so bold as to say that it is the very best piece of English language GPL-ware on the web for finite element analysis.  There is a graphics pre/post-processor program Graphix, that supports the solver program, Calculix.  It handles a wide variety of mechanical, thermal, coupled thermomechanical, and contact problems,as well as field problems. It is well documented, regularly updated, and well supported.