Personal Reminder 2.0 is a no-frills reminder tool that pings you with an alarm and a pop-up whenever you’d like.   I’ve been using it for my Ten Minutes at the Top of Every Hour method, and its functioning as promised. I’ll be testing other programs
in the future, but for now here’s what to know for Personal Reminder
2.0:

Pros

• Free
• Easy-to-use
• Pre-sets for repeating daily, weekly, weekdays only, etc.

Cons

• No option for silent alarm (i.e., pop-up without sound), and the three sounds they offer are boring and/or unpleasant.

There are lots of free and/or cheap programs out there (each with a
variety of different features), so I’ll keep you posted on what else I
find. If you’ve got some nominees, let us know!  And if you want to go
exploring right now, do a search for “reminder software” on Google or at just “reminder” at TUCOWS.