CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Registry Workshop - Registry Workshop is an advanced registry editor.
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
RegCool - RegCool is an advanced registry editor.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Registrar Registry Manager - Advanced Registry Manager for Windows