Downloading DynaPile 2016.3.2 from our website was free. The most popular version among DynaPile users is 1.0. This software is a product of Ensoft, Inc. DynaPile is included in Education Tools.
From the developer:
Program DynaPile was developed to compute the dynamic stiffness of single piles or pile groups. The piles can be either floating piles or end-bearing piles. Vertical, horizontal and rocking dynamic stiffnesses will be generated by the program. The program will also generate the group reduction factors for pile groups under small excitation conditions.
You may want to check out more software, such as StatPlus 2007, Adding Machine or PC-Display, which might be similar to DynaPile.