Download LPILE Plus 6.0 from our software library for free. The actual developer of the program is Ensoft, Inc. The program belongs to Photo & Graphics Tools. The most recent installer that can be downloaded is 8.6 MB in size.
From the developer:
LPILE Plus is a special purpose program based on rational procedures for analyzing a pile under lateral loading. The program computes deflection, shear, bending moment, and soil response with respect to depth in nonlinear soils. Components of the stiffness matrix at the pile head may be computed internally by the program to help the users in their super-structure analysis.
You may want to check out more software, such as EasyPlan, VFDS or DesignCAD Express, which might be related to LPILE Plus.