When we launched LimitState:GEO in early 2008, we prioritised SI Units. With the latest version, the LimitState:GEO interface can display either Metric (kN, m) or Imperial (lb, ft) units. Users can switch units for the entire application by selecting Tools > Preferences > Units

Selecting the option “Use defaults tailored for Imperial Units” means that default material properties are rounded appropriate to the units, rather than being equivalent to the SI values. This means that, whichever units are selected, users are presented with intuitive values, but keep the ability to analyse models created anywhere in the world and get identical results.

Erik Funegard of our US distributor GEMSoft says,  

LimitState:GEO has had a very good reception among our geotechnical customers. Everybody, without exception, is impressed by the combination of simplicity of use and sophisticated analysis, allowing the engineer to analyze far more alternatives than previously possible. We have also been very impressed with LimitState's responsiveness to questions about the software and to suggestions for improvements.

LimitState:GEO allows free switching between imperial and SI units. Whichever is chosen, all displayed values use the selected units. In this image, units of different dimensions are displayed in the property editor.