For the last couple batches of beer that I’ve brewed (since starting to go all grain), I’ve been using the Brewtarget software to keep my recipes in order. Brewtarget keeps a library of recipes for home brewing. Additionally, it handles all of the calculations (target gravity, bitterness, ABV, etc) and even generates instructions for brew day. I’ve found it extremely helpful. Plus it is open source, which is always a bonus.