What's In Your Mac Toolbox?

"Working as a Mac consultant brings me in contact with several dozen different Macintosh systems every month. Many needs and tasks are common - OS upgrades, backups, system slowdowns, troubleshooting startup or WiFi problems. Like any good mechanic there are a few items in my toolbox which I favor above others. From built-in tools like Disk Utility, Network Utility and Console to third-party tools like DiskWarrior, FileSalvage and iStumbler, these items help get the job done."

There are many useful tools, some I even use such as CarbonCopy Cloner and DiskWarrior, that are mentioned in this article. As I read the article, it brought to mind a question for me, namely what do you use to keep your Mac running smoothly? Are any of these tools in your toolbox or do you have others that work better? Or do you use different ones to maintain your Mac?