# There are many pieces, or frameworks, or calculations systems already. Some actually pretty good. But so far nothing with a...

Commenting post [121](/?blog/2015-121): There are many pieces, or
frameworks, or calculations systems already. Some actually pretty good.
But so far nothing with a complete interface, or easy to use. Those I
know of are these:

<https://sourceforge.net/projects/frame3dd/>
<http://www.calculix.de/>
<http://pybar.fr/>

But have also a look at the FEM workbench of FreeCAD too (
<http://forum.freecadweb.org/viewforum.php?f=18> ), things are evolving
fast and well there...