We have to submit yearly documents to our customer. Does anyone have a good app to track this and automatic alerts?

I looked through the exchange, but I didn't find exactly what I am looking for.

Basically we submit documents to our customer on a certain date.  Then each year after we need to resubmit the documents by the due date.  I have an idea how it could be created, but if there was something already out there that was close I could slightly alter it.