What programs can be used to optimize my computer’s performance?

1. Disk Cleanup (Windows)

2. CCleaner (Windows & Mac)
3. Glary Utilities (Windows & Mac)
4. System Mechanic (Windows & Mac)
5. Avast Cleanup (Windows)
6. Advanced SystemCare (Windows)
7. Malwarebytes (Windows & Mac)
8. Mac cleaner (Mac)
9. CleanMyMac (Mac)
10. iolo System Mechanic (Windows)