Shared Gcalendars with my husband;
Evernote for lists of things "I want to get to at some point";
GTasks (on my phone) for all my tasks (I've paid for the premium version that includes repetitive tasks); I spend about one hour Every Sunday generating a list of all that needs doing that week (since it's very variable) and checking with planned tasks that it is doable;
Running shopping list on the fridge;
"Weekly meal plan" on my laptop--I jot down ideas when I encounter them, so I can go back to it when planning grocery shopping.
Bills and such are opened on the day that they arrive--either taken care of immediately or entered in Gtasks. Same for emails.
This may seem like a lot, but I'm naturally disorganized and forgetful, so I need to "outsource" structure. In fact, when I am in complex "commitment juggling" periods (like right now), I also take 5-10 minutes every evening to outline the following day (hour by hour) and in the evening I compare what I had planned to what I actually did. In the long run, the exercise has helped me rein in my "time optimism" a bit, and I feel better because I know I got a lot done even though I didn't actually write, work out, volunteer, clean, teach, cook, read, socialize, review my languages, etc. that day.