226786 Occasion Reminder Script

I have heard of these scripts but do not know where to go, to find them. I want a reminder script that: 1. runs on Linux 2. One that allows the user to add different occasions and the date they want to get reminded 3. also sends an email on that day to the person on their occasion so they will know you are thinking of them and it has to be one of a few scripts with the selection box of the occasion added 4. offer it as a free service for 1 reminder, but users who like the service must pay $ certain amount monthly for continued use per certain amount of reminders added under their account. They should be able to email their contacts from their panel also