This Chrome extension, which is free, will notify you of any new item you haven't done yet. For the people who already use the extension, it will give you a gentle reminder of the most important items, like emails and shopping orders.

The goal of this Chrome extension is to remind you about the most important things you have to do. You can choose to get a notification only on the hours you have available.

You can also add as many reminders as you need and set your own time intervals. In addition, you can give yourself a reminder on a fixed date.