Google sheet.
Columns for application deadline, other deadlines, when to expect a decision, whether it needs official score report, recommenders, what sort of essays needed, arts supplement and deadline if different, etc.
Plus a column with a pulldown for “STATUS”: app started, app submitted, app received, portal setup. (I expect that a bit later in the process we’ll add some things to that status like accepted, deferred, etc.)
I admit that I really like color-coding stuff in these sheets too. 