I am agree with Zheng-Kun Liu, but still ypu can find other open source programs like Z88, ONELAB, OpenSEES, FEAP, CAST3M,

SU2 Code or SfePy

Thanks a lot for your answers.

I'm going to watch all this.

Zheng-Kun Liu

ansys

i am personally mastering getfem++ for decades. The XFEM example is provided and based on Ted Belytschko and his followers works.

http://getfem.org/screenshots/shots.html

It is not easy to use code but once you have got how to deal with it you'll value it

Farzin Ghaffari, Egor Vtorushin : Thank you both for your answers.

There seems to be a multitude of choices.

I think I test several codes to compare them on the same problem.

In any case, thank you to everyone