Regshot is a tiny open source portable registry monitoring tool. This diff comparison tool allows a user to take a snapshot of the system registry and compare any registry modifications made after doing system changes or installing new software. The detailed report contains a list of all registry modifications or changes between the two snapshots and can be exported in either text or HTML format.
RegScanner; Is a Windows registry viewer or registry search tool that lets you scan the Windows registry for values that match your specified search criteria. The registry scanner will then display the search results in a list for easy viewing or editing, eliminating the need to press F3 repeatedly to find the correct value. The resulting list can also be saved as a .REG file that can later be used in Regedit.
RegASSASSIN is a portable registry tool that can be used to remove even the most stubborn of registry key entries. It does this by resetting any of the key's permissions and then proceeds to delete the entry. This Registry editing and key removal tool makes for a great addition to anyone's portable software tools collection.
EasyCleaner is a free and portable system cleanup utility for Windows that helps users remove temporary files, invalid registry entries, broken shortcuts, duplicate files, and other unnecessary data that can accumulate over time. Developed by ToniArts, EasyCleaner combines several maintenance tools into a lightweight package that can be run directly from a USB flash drive without installation.