The latest version of the X2SW software bundle combines two the most popular at the moment slicers (Slic3r & Skeinforge) and Printrun printer interface software. It might be used in a binary form (self-contained, no need to install dependencies) or run from sources. The installer for Windows can do all the work (including Arduino drivers pre-install) to get a MS Windows PC ready for driving a RepRap 3D printer.
The x2Profiler tool included in the package helps to download the configuration files for the priner. The configuration files come from the online or local repository. Storing the profiles in the online repository allows for the experienced RepRap printer operators to share their profiles with the rest of the community.
There are several example profiles for RepRap printers available at the moment. For example RepRap/X2V3/experimental development profile enables all the dual extruder features and both slicers. The old Skeinforge-only profile for Makerbot CupCake that has none of those capabilities doesn't expose any of those features. What is and isn't there is controled by the Printrun .pronsolerc file coming with the profile.
The X2SW bundle also contains the X2SW Merge tool capable of merging Skeinforge-generated "penultimate" g-code for two objects into one file for dual extruder printing of multi-color objects or objects made of different materials.