The Cal Ripken Collegiate League is certainly worthy of this list. 10 years ago it used to rate as one of the better summer leagues. I don't know about today as it has been a few years since I attended one of their games. Based on their alumni, it still looks like a pretty good summer league. http://www.calripkenleague.org...lripkenleague/alumni
PS...@2022NYC I know (10 years ago) the Cal Ripken League had a handful of rising freshmen (mostly D1 P5 or D1 mid-majors programs) on their rosters.