Everyone collects utilities, and most folks have a list of a few that they feel are indispensable. Here's a list by Scott Hanselman saying... 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. Many/most are free some aren't. Those that aren't free are very likely worth your 30-day trial, and perhaps your money.
Complete list...