Obligatory: ‘Rules for Rulers’ is a very condensed summary of Bruce Bueno de Mesquita and Alastair Smith’s ‘The Dictator’s Handbook’.

Loop Habit Tracker is pretty good for this. In particular, it allows you to schedule stuff like ‘twice a month’, or even ‘run 10 km a week’ or somesuch. The app shows the whole list, but marks which tasks are done and which aren’t yet. Plus there are notifications and widgets, but I haven’t used the latter.

Best part is that it’s open-source and requires nearly zero permissions. OTOH the data isn’t synced anywhere.