Primarily, aside from scioly, I used to do quizbowl and astronomy club (they were both kinda weak at my school, but I did it anyway). I also visited matheletes often just because a lot of friends were in it. Yes, participated at tournaments, but I didn't spend any time prepping or anything.
Technically I was involved with FTC (because we couldn't do FRC), but my school ran it as a class when I was around. We weren't the best or worst team, but at the end of the year we couldn't even get to the competition >.<.
Mostly I just tried to do a variety of the STEM clubs. Of course, things have changed by now in college, but there's still astro club and scioly volunteering;).
B: Crave the Wave, Environmental Chemistry, Robo-Cross, Meteorology, Physical Science Lab, Solar System, DyPlan (E and V), Shock Value
C: Microbe Mission, DyPlan (Earth's Fresh Waters), Fermi Questions, GeoMaps, Gravity Vehicle, Scrambler, Rocks, Astronomy
Grad: Writing Tests/Supervising (NY/MI)