I have an app that I use that tracks everything ball python related that I have had in beta for the last couple months. It utilizes an engine that I developed for my real job. I am going to put it up for free usage as soon as I get past some deadlines for the stuff that actually makes money. Has a genetics calculator too however I don't have enough pics yet to make it pleasant to use.
Stuff that is needed at a glance I actually write on the tubs with a sharpie. Last shed, any feeding issues, who they are being mated with etc.