A free program for Android, by Reminder Set.
Reminder is the best way to make sure you don't miss anything, whether it's shopping or a meeting. With the app, you can create a list of to-dos, set a reminder for them, and get notified when the time comes. It's very easy to use, and it can help you remember all the things you need to do.
To-dos lists are a great way to plan your day, but they're more than just that. By planning your day in advance, you can make sure you're doing the right thing at the right time, and you won't forget anything.
You can also use Reminder for other things. For example, if you need to meet with a friend, you can set up a reminder for them, so you won't forget the meeting.
