TFEL/MFront introduces DSLs based on C++ to handle material knowledge
API for Password Manager Daemon (pwmd)
OpenNum lets you distribute solvers with a nice graphical interface
The JuliaFEM software library is a framework
Fortran library with the Abaqus user material subroutines UMAT/VUMAT
Advanced numerical instruments: adaptive meshing, FE methods, solvers
Advanced numerical instruments: adaptive meshing, FE methods, solvers