Onyx by Titanium - This website provides operating system utilities for macOS
Autoruns - See what programs are configured to startup automatically when your system boots and you login.
MacPilot - Unlock over 1200 features in Mac OS X and optimize your system!
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Alfred - Alfred is an award-winning app for macOS which boosts your efficiency with hotkeys, keywords, text expansion and more. Search your Mac and the web, and be more productive with custom actions to control your Mac.
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.