Tron Script - Tron is a glorified collection of batch files that automate the process of cleaning up Windows systems.
Registry Workshop - Registry Workshop is an advanced registry editor.
Autoruns - See what programs are configured to startup automatically when your system boots and you login.
RegCool - RegCool is an advanced registry editor.
SKTools - SKTools is a multi-featured and easy-to-use application that is bundled with over 60 tools to help you boost the performance of the system.
Regedit - The Microsoft Registry Editor (regedit.