I suppose you mean software, and by manage you mean maintenance tools, tools that you use all the time as opposed to one-off cases where you might use a specific tool once to solve a specific problem that won't likely appear again.

If that is the case I don't use any tool. I don't use notes, neither software notes nor paper notes, and I don't use calendars. I try to keep my life free enough of stress so that I don't need calendars to remember what I have to do. If I can't remember what I need to buy, it probably means I don't need that item anyway.

I don't use spreadsheets or anything like that for tracking expenses either.

Of course I use stuff like e-mail, although I would not put that into life-management category.