Windows only: If you like to keep a close eye on what changes new software installations make to your system, SpyMe Tools provides step-by-step snapshots of your registry and shows you what's changed. The in-depth review of your system registry that SpyMe Tools provides may be overkill for some people, but if you need to track changes or troubleshoot problems after certain installations, it can be invaluable. It's simple to use: after you install the program, you run a system sweep with SpyMe Tools and save the results. After installing new applications or making system changes, you can compare the previous system state to the current one, and SpyMe Tools will show you all the changes. In addition to doing a before and after comparison of system snapshots, you can even run it in real time while installing software to see the changes as they happen. If you're interested in a more automated solution, check out previously reviewed Revo Uninstaller, a thorough application remover that our commenters frequently compare just about every system tool to (and that's why we love you). SpyMe Tools is freeware, Windows only.