Win-UFO is a collection of around 100 popular freeware PC forensics and system information tools. The majority are from NirSoft, but there are also antivirus programs, undelete tools, file viewers and more. The developers say it's aimed at parents who want to be "proactive" in their child's life, to "know what they are doing online", "what they are searching for", and generally what's happening on their PC.
There are a lot of tools to explore, but Win-UFO helps out by organising its collection into eight categories: "Browser History", IPhone", "Log Viewers" (see recent activity on your PC), "Malware" (ClamWin, HijackThis, McAfee Stinger, Spybot - Search & Destroy), "Password Recovery" (reveal passwords stored on your PC), "Reports" (crash reports, S.M.A.R.T. tools, startup program lists, more), "Viewers" (VLC Media Player, IrfanView), and "Other" (clipboard tools, file recovery, search tools, network scanners, more).
Each of these menus only provides the name of each program, which may not always be much help. But if you're not sure what something does, hovering your mouse cursor over it displays a tooltip with more help. So, for example, you'll learn that USBDeview "lists all USB devices currently connected to your computer, and that you've previously used".
Win-UFO also warns you if a particular program will change the current system (create a file or folder, adjust the Registry), handy if you're using it as a forensic suite and don't want to leave any sign you've been around.
Combining third-party tools like this isn't always a good idea. It inevitably means that Win-UFO will have a lot of programs you don't need. It'll be harder to ensure you get the right version of an individual program (32/ 64-bit). There's no guarantee you'll get the latest version, either.
Win-UFO is certainly a quick way to obtain a library of useful system tools, though, and if you don't have time to build your own collection then it might be worth a try.
The best way - by far - to build a collection of forensic PC tools is to explore sites like NirSoft and Sysinternals, download and try out individual programs for yourself. But if you're not technically confident enough to do that, or you just don't have time, then Win-UFO provides a useful collection of free programs which can help you quickly find out how a PC is being used.