SuperTux is loosely based on Mario and there are tons of scrollers out there, so I don't think it's worth to add it. SuperTuxKart is similar in that it doesn't

SuperTux is loosely based on Mario and there are tons of scrollers out there, so I don't think it's worth to add it. SuperTuxKart is similar in that it doesn't even mention Mario Kart anywhere, which I take for being a bit more separate/independent from franchise than most games in this list are.