Little Registry Optimizer is a part of Little Apps` Little Registry Cleaner. This project is aimed to analyze the windows registry and (if needed) optimize it so it will be smaller and run smoother when the computer is rebooted.Discontinued
No longer updated. Last version was released in 2011. See https://www.little-apps.com/little-registry-optimizer/
Registry Life helps correct errors in the registry and optimizes it, increasing the working speed and stability of the system. It's a compact, simple to use, and FREE solution for servicing your system registry.
Simnet Registry Defrag is an extremely easy-to-use and freeware utility that allows you to defrag windows registry. Over time, with daily use of windows, systems registry becomes fragmented and response times of applications increases.
"Registry defragmentation" performs physical defragmentation of the Windows registry file. After defragmentation your registry will acquire linear structure which will reduce application response time and registry access time.
Quicksys RegDefrag is a small, clear and easy freeware utility to defrag and compact Windows registry. It optimizes registry by removing gaps, fragments and wasted space in Windows registry files.
Last version, 2.9, was released on August 11, 2010. It can be still downloaded from Wayback Machine.