I'm interested too. I've been using BeerAlchemy for over 10 years, and it appears that it is no longer being developed or maintained.
One thing that I love about BeerAlchemy is that I can sync between my iMac and iPad. I use the iPad during brew day, and the iMac for recipe creation. On the iPad, I can create a new batch from a recipe, enter all the batch parameters, deduct the ingredients from inventory, take brew day notes, then store the batch as a daughter file of the original recipe. Once brew day is complete, I can sync that back to the iMac.
I wish it had a way to schedule the next steps, but I just used the calendar app. It would be a nice feature to have.
I'm looking forward to seeing what you develop.