I'm pretty fond of the Mutant Crawl Classics RPG. To hamfist a quote inspired by Spinal Tap: "This Gamma World Clone goes to Eleven!" Note, no drummers were killed creating this RPG ;)
So, what is SCIENTIFIC BARBARIAN No.3? According to the Kickstarter page, "Bigger and better than a fanzine, not quite as fancy as a magazine, SCIENTIFIC BARBARIAN No.3 is a megazine. It’s 6” x 9” in size, with 64+ pages of professional gaming content created and produced by industry veterans. Our megazines are also perfect-bound with a spine, so they stand up nicely on a shelf as you collect them! This is an exciting new format we here at Mudpuppy Games are proud to pioneer, and we can’t wait to see how many others adopt what we think is a pretty handy format for jamming a publication straight into your game bag or your backpack."
So, a zine that goes to Eleven! Cool :)
Does that mean that SCIENTIFIC BARBARIAN No.3 is specifically written for the MCC RPG? No, but it will certainly fit very well with MCC, Gamma World, Mutant Future, and the like. Heck, even fits with your OSR fantasy rules if you want to push your campaign in different directions.