I was reading some papers at Universia, and I've found this one which references the Gmsh, a apparently simple mesh generator with an simple integrated CAD. It also has screencasts showing how to use it.
Gmsh was is developed by the professor Christophe Geuzaine for academic uses. I didn't read much, but Gmsh is apparently scriptable and the CAD tool is realy simple to use. I was planning to develop something very similar. Another cool thing at the professor's site is the project GL2PS, which the main idea, on convert OpenGL rendering in PS, PDF and SVG, I was also thinking in.
Professor Geyzaine had also written an finite element solver, the GetDP.
I am planning to use them all on some grad school works.
Another code on Finite Element Analysis is the SLFFEA, which stands for San Le's Free Finite Element Analysis, deserves note and is entierly written in Ansi C.