RailClone Lite is free to use, even commercially. It provides many of the features found in RailClone Pro but is limited to 3 segments, 1 generator, and flat splines. The Lite edition has a limited subset of library styles, and does not include RailClone Tools, the ability to collapse to a mesh, or user editable libraries. If you want to know the differences between our Pro and Lite version, please read this documentation
Note: This app uses a custom installer (and not the standard App Store installer).