InterKalacting is a KSP Kopernicus Planet Pack which adds 4 new planets, and rearranges the entire Kerbol system, making sure that there's no place you won't want to explore, aswell as making sure that gameplay is fun and different, starting from the second you create a new career save. For more information, you can click here to visit the forum page, or here to check out the mod on SpaceDock. This mod is still in Beta, so created a long-term career saving might be risky, although I currently have no plans to change the orbits or characteristics of any current planets.
If you are interesting in extensions for InterKalactic (such as OPM compatibility) visit the forum page. If you have any questions, asking them on the forum page is usually the quickest way to get a response.
Current Version: 0.1.1_beta