Civil Engineering Association - The simplest 3D opensource geotechnical software

Hello,
I was wondering does anyone knows some simple, easy to learn open source software that can be used to perform 3D FEA of geotechnical problems?
I would like to see some other opinions.
Best regards
freequo

I worked very little using this. I don't know much in detail

OpenSees

A software framework for developing applications to simulate the performance of structural and geotechnical systems subjected to earthquakes.

Code:
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Best regards cace-01,
But is it Opensees the only one? I assume that everyone else uses some high class, glossy picture like softwares?