Tech Tool Store - Tech tool store is an IT professional application which contains more than 600 free technician tools packed in a simple, fully featured interface.
RegCool - RegCool is an advanced registry editor.
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.
Regedit - The Microsoft Registry Editor (regedit.