I am quite a newbie in FREECAD but if I look on @bernd's list of
FEA solvers and some of the other posts I feel like home.
Code Aster is absolutely great in nonlin and thin structures,
best part under LINUX, WIN port (but with less capability) exists.
Someone interested in beam-truss models like the one needed for
MERO or alike spacial structures?
Maybe we could adapt the FRAME3DD methods?
Looking foreward on coming posts.
Have a good time all - Volker