CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Unity Tweak Tool - Unity Tweak Tool is a settings manager for the ...
BleachBit - When your computer is getting full, BleachBit quickly frees disk space.
dconf Editor - dconf is a low-level configuration system. Its main purpose is to provide a backend to GSettings on platforms that don't already have configuration storage system.
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Sysinternals Suite - The Sysinternals Troubleshooting Utilities have been rolled up into a single Suite of tools.