Everyone collects utilities, and most folks have a list of a few that they feel are indispensable. Here's mine. Each has a distinct purpose, and I probably touch each at least a few times a week. For me, util means utilitarian and it means don't clutter my tray. If it saves me time, and seamlessly integrates with my life, it's the bomb.
Here are most of the contents of my C:/UTILS folder. These are all well loved and used. I wouldn't recommend them if I didn't use them constantly.
This page includes a huge list of life changing utilities for you.