Dimension 4 was originally released in 1996, and it's a consistent performer, which is why the techie-type people continue to recommend it! It will keep your PC clock synchronized, so you know at least one clock in your life will have the correct time!
Especially important if you use any type of software that is time-sensitive and relies on your PC clock (like for eBay launches), or if you have to leave to pick someone up, and you're relying on that little toolbar on the computer screen to tell you when to go (you know kids especially hate to be the last one picked up!).
Here's a screenshot:
Free for for private use (use at home), educational use (by schools and universities), and use by charitable organizations. Small fee for commericial use, and anyone can make an optional donation to fund further development.