Diablo95 - Parallel finite element simulations in Fortran 95.
DLEARN - Linear static and dynamic finite element code.
Elmer - Fortran 90 code for multiphysical problems.
Finite Element Analysis Program (FEAP) - General purpose finite element analysis program which is designed for research and educational use. Source code of the full program is available for compilation using Windows (Compaq or Intel compiler), Linux or UNIX operating systems, and Mac OS X based Apple systems.
GeoFEM - Written primarily in Fortran 90 and MPI. Parallel finite element codes for linear/nonlinear solid mechanics and thermal fluid simulations, parallel iterative linear solver library, partitioning subsystem, parallel visualization subsystem and utilities for parallel I/O and coupling of multiple codes.
MultiGrid Galerkin Hierarchical Adaptive Triangles (MGGHAT) - Solve second order two dimensional elliptic partial differential equations, using adaptive refinement of second, third, or fourth order elements, and multigrid solution techniques.
PDE2D - Program by Granville Sewell to solve quite general nonlinear, time-dependent, steady-state and eigenvalue systems of partial differential equations, in 1D intervals, general 2D regions and 3D "boxes". Available for both Unix and Windows platforms.