Repetier-Host has an easy GUI and includes a great G-code visualizer. It features a large collection of unique options, which we'll explore further in Chapter 8, Troubleshooting Issues in 3D Modeling. Its slicing options include configured versions of both Slic3r and Skeinforge, making it easy to switch from one slicer to the other when needed. Refer to the following screenshot:
User information and download options are available at http://www.repetier.com/.