The Broken Bat league above is so much like Buzzer Beater that you'd think they copied off BB.
Almost everything is exactly the same, except Broken Bat is still in the early stages of Beta Testing, so the Economy is pretty meaningless. You still make money and spend money right now, but there is a message saying it will reset again soon for the testing and not to put time into trying to build up money.
Their website at Broken Bat is also pretty generic compared to BB, but, it seems like a pretty good game and I'm certainly not complaining about it.
But everything is the same. You train your players by leaving them in the minors. Once they are in the Majors, the training stops. Players who are 18 and 19 in Rookie and A ball train the fastest. They completely stop training at 25 no matter if they are still in your minors or not.
Again, there's nothing that BB offers that Broken Bat doesn't, not that I can see. Tuesday is Day One of the season, so we'll see how well my team does there. I played two cups games today and won both vs bot teams. In Cup action, you play a 3-game series. I won 11-2 and 8-2 today.
If you guys do continue to build your own baseball sim, keep me informed. I'll for sure join. Probably be willing to help with some of the work to get it off the ground if there is anything I can do to help you.