I've got four children, currently in 3 different schools, between them we do swimming (2 different groups), guides, brownies, flute, gym, french club and two youth clubs. We need to be organised :)
I had one of those life book diary things you lined too and it didn't work for me. I found it far too difficult to have a small diary thing to carry round as well as a proper calendar on the wall. Some things were in the diary others on the calendar and we ended up double booking ourselves!
the calendar by itself is fab :)
www.organised-mum.co.uk/Family-Home-Planner.html
for budgeting I use a program (YNAB) on pc and the corresponding app on phone
for lists I use word on pc for some things and a notebook for others