Windjammer
Adventurer
It requires the 4E rules set because the ruleset doesn't just provide some random DCs, but also suggested damage values that are "balanced" for that level.
It wouldn't make sense to be transplant it 1:1 to M&M or 3rd Edition, since they have different assumptions on damage per round, difficulty of tasks and the action economy.
For what it's worth, you could run with the basic idea easily enough in 3E. Simply set the PC's Balance/Jump/Tumble check DC at the monster's defense "score" (simply assume the monster is taking 10 for its Save roll). Then gather the necessary "average damage per level" numbers from the Pathfinder Beta RPG, chapter 12, table 12-6, entries "High Average Damage" and "Low Average Damage". That table contains average damage output by monsters - per CR, ranging from 0.5 to 20 - but gives the DM a good idea which numbers to assign for your PCs. Finally, for a neat complete listing of all conditions your PCs' stunts might inflict on the monsters, keep Rules Compendium (pages 34-35) flipped open at the table.
Either that, or have a look at Book of Iron Might, chapter 1, or Iron Heroes chapter 5 for a 3.5 stunt system. The nice thing with the former is that it gives you all the DC numbers you'll ever need - something I've (so far) had a hard time to extract for 4E. Before this thread, that is!

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