Here are a couple of applications which I think could be useful.
Backpack primarily designed for business but since it allows you to share information between several members in a group it would seem a good tool for sports teams or family groups. Backpack keeps your documents, discussions, and schedules etc. in one place all the time. There is a cost however but if you have up to six using it is only $24 a month.
The other is Notely a new online tool for students of all ages looking for help to get better grades. Notely has all the tools a student could need, schedule, calendar, note-taking, homework planner, and more and appears to be free.
I love organizers, I just wish I could get one for my closets but they have yet to invent a computer program that does that. LOL