J.W.
I use Cozi. It's online and available on my phone. I also love that I can set it up to send reminders to hubby and all of my kids for events, appointments, etc.
It also has to do lists, shopping lists, etc. which I find very useful. For example, I was able to enter an Easter shopping list and check things off as I picked them up to make sure I had everything I needed for this weekend.