http://www.csc.fi/english/pages/elmer

Elmer is an open source multiphysical simulation software developed by CSC. Elmer development was started 1995 in collaboration with Finnish Universities, research institutes and industry.
Elmer includes physical models of fluid dynamics, structural mechanics, electromagnetics, heat transfer and acoustics, for example. These are described by partial differential equations which Elmer solves by the Finite Element Method (FEM).

Thanks, I just started looking at Calculix. I am pretty impressed by it and love the fact that it uses a similiar/same format as ABAQUS. Pretty clever idea. I am thinking it will work well, but still some investigating to do.

CalculiX sounds like it might do what you want. There's two executables, a solver and a pre/post-processor. The solver uses Abaqus' input format, which you could manually create in a text editor and copy in the values you need. Alternatively, I've had some success using a VBA script to create the script based on mesh coordinates in the spreadsheet.