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Windows only: Free applicaiton inSSIDer scans networks within reach of your computer’s Wi-Fi antenna, tracks signal strength over time, and determines their security settings (included whether or not they’re password-protected). Previously mentioned NetStumbler has long been a favorite for this sort of functionality, but it doesn’t work well with Vista or 64-bit XP. inSSIDer, on the other hand, works like a charm on both Vista and XP, and it’s open-source to boot. This must-have for hunting down Wi-Fi networks on the road is free, Windows only, requires .NET 2.0. Mac users, check out previously mentioned iStumbler.

Windows only: Application Monitor is a free utility that monitors user-specified applications to ensure they’re running. If a program is not running, Application Monitor restarts it. Let’s say, for example, your roommate is prone to shutting down your BitTorrent client when you’re away from your computer. You return home expecting the movie you’d been downloading to be ready for your viewing pleasure, then discover the download hasn’t even been running. If you had set Application Monitor to keep an eye on your BitTorrent client, it would have automatically restarted your BitTorrent app and you’d be enjoying a fresh bowl of popcorn right now. Application Monitor isn’t something you’d want to set up with every application on your system, but under the right circumstances it’s really handy. OS X users, check out previously mentioned Lingon.

Windows only: Free application MRU-Blaster detects and cleans Most Recently Used (MRU) lists from every corner of your computer. Most of these lists are stored in your Windows registry, which means it’s not easy for someone concerned with his privacy to hunt them down. MRU-Blaster makes it easy: Just hit Scan, then Clean Now. As the gHacks post points out, the app still finds and cleans a significant number of MRUs even after running the very popular CCleaner, which might make it worth an installation in conjunction with CCleaner. You can also set the app to run on a schedule or every time you start up your computer. MRU-Blaster is freeware, Windows only. If you give it a try on your system, let’s hear what kind of results you had in the comments.

Windows only: Free application ClickGone (or One Click App Killer—there’s some confusion over the actual name) turns your mouse cursor into a crosshair and forcibly kills the first app your pull the trigger on. Although it’s fun to fire up Internet Explorer and kill it for sport, the application is actually intended to kill off frozen apps quickly and easily. Assuming you were to create a keyboard shortcut to run ClickGone, it could serve as a simple go-to for knocking out a stalled application. This single-use utility is freeware, Windows only.

Windows only: Free application SpeedFan monitors the fan speed, temperature, voltage, and more of the components inside your computer. That’s all fine and dandy, but the marquee feature of SpeedFan is that you can actually adjust the speed of your fans by tweaking the desired temperatures on supported systems. Keep in mind that SpeedFan is a power-users tool, and the temp inside your computer isn’t to be taken lightly. However, if you’re comfortable tweaking hardware settings, an app like SpeedFan can help keep your computer running quieter and give you a little more control over what’s happening with your computer’s innards. If you’ve used SpeedFan in the past, share your experience in the comments. Mac users, check out previously mentioned smcFanControl.

Windows only: Free application MZ Ultimate Tweaker is a system modification tool that covers the gamut of system tweaks, putting everything from performance to display tweaks just a few clicks away. The application is very similar to the TweakUI Windows XP PowerToy. But apart from all the minor modifications it can make to your system, it also comes loaded with several useful utilities worth checking out.

Those utilities include an advanced shutdown scheduler, startup manager, services manager, and registry backup tool.

All of the utilities are available as separate downloads from the MZ Ultimate Tweaker web site, so if you just want an à la carte utility, you can grab it as a standalone. Utlimate Tweaker also includes a few snake-oil utilities promising to speed up your computer, so stick with the useful ones. Regardless, MZ Ultimate Tweaker gives quick and easy access to tons of worthwhile Windows modifications, so if you’re a junkie for a good tweak, give it a look.