I don't know of any other diet that replicates the benefits offered by the ketogenic diet.
If you're looking for variety, you may consider carb-cycling, or the "anabolic diet," which utilizes carb-cycling. The idea is similar; priming the body to burn fat rather than carbs for fuel, and I know of several people who use carb-cycling for contest-prep. http://www.everydiet.org/diet/anabolic-diet
Some folks reportedly experience some of the same benefits of ketosis (energy, mental clarity, fat loss, etc.)
on the "paleo diet," which offers a bit more of a variety of foods and can be less structured than some diets of the type above. http://thepaleodiet.com/about-the-paleo-diet/
Know that there are criticisms regarding the effectiveness and safety of these diets, particularly in using them longterm. Of course, you can find just as many studies that support their safety and effectiveness. Just use caution and common sense.