No program available; home schooled are valid answers. Actually, I have a problem with public schools not letting home-schooled athletes play in their school district. I'm sure you could find some pretty stellar home-schooled college players, too. I'm betting the odds are stacked against the kid who CHOOSES not to play, versus one who has no options to play. A BIG difference.
In a recruiting interview, the coach may not even bring up your summer travel ball team. He/she doesn't need to - they watched you play all summer, and that's why you're sitting in the chair by their desk. However, college coaches rarely, if ever, get to see your high school games, because that's when the college season is - like right now. They'll ask you in those "Monday phone calls" how your high school season is going. Notice - an open ended question.
Some kids and parents think it's weird that the coach "didn't even talk about softball that much". There's a reason. They already KNOW how good of an athlete you are. They want to find out if your head is screwed on straight. Signing a recruit has a degree of risk, and the wise college coaches are very good at minimizing that risk.
To answer the question - looking at various college rosters on their internet sites may give a clue. But one thing that may be misleading is I'm not sure all JC transfers list their high schools.