CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Autoruns - See what programs are configured to startup automatically when your system boots and you login.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Advanced SystemCare - Free optimization software & registry cleaner for Windows 10, 8, 7, Vista and XP. Advanced SystemCare Free to speed up PC, clean registry and repair system in one click.
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.