From DoubleWedge Productions:
E-ReAlm is an useful application that allows you to create programmed alarms to help you remember all your dates and appointments. This alarms can be set to go off once only, or once a year, a month, a week, a day at any hour of the day. You can also add a text to the alarm, as well as a sound that will be played when the alarm goes off. The interface was designed to be the most intuitive and simple, as you can get to all options from the main window. The hidden mode and the icon tray menu, allows you to have E-ReAlm opened (so that alarms can go off) while you work with your computer, without having the programs window in screen.