Reminder is an app that you will wish was included with the phone from the beginning. It allows you to set reminders to go off but without the need to put anything in your calendar. It keeps your calendar clean and just showing actual appointments you have instead of being filled with the reminders you may have for each day.
For free, you get time-based reminders that you can use as much as you like. If you want some of the additional features, they are available through In-app purchases. Those features include:
Location based reminders: get reminded to do something when you arrive at a particular location. You can use your current location or add addresses yourself.
Time and location based reminders: get reminded to do something when you are at a particular location at a particular time. If you aren’t at that location, no reminder will happen.
Calendar reminders: get reminded to mute your phone when a meeting is beginning and unmute when the meeting ends. In the settings, you can pick the status(es) that will trigger the reminder so it will only occur for meetings you care about, for example, if your status is set to Busy.
There is an update coming shortly that will allow you to backup and restore your database from SkyDrive.
Also, the app is running a Full-featured Trial that allows you to experience the full app! Just purchase the Full Trial inside the app to get all features and see when it will expire. The trial is a free purchase
Reminder is a Windows Phone 8 app. You can get Reminder here. Or just scan the QR code right.