I am looking for a slope stability analysis software package with at least 10 licenses with reasonable cost for my advanced soil course (student's vergin). Is there any free online one??
SVSlope, from SoilVision, is a robust software with 2D and 3D versions. It offers a Classroom edition (https://soilvision.com/resources/academia/classroom-edition) that meets your requirements for a reasonable price as well as a free student version.
I agree with Igor, Rocscience Inc. offers a great deal for the academics which many companies dont. You can have lots of softwares for different purposes for a relativelt low amount of money.