Top rated in System Optimization

Battery Monitor
2.7
Small auxiliary application useful in maintaining the life and optimization of a laptop battery.
Housekeeper
2.0.10
Housekeeper trashes various caches and temporary files.
BlueHarvest
7.1.2
Preference panel which allows users to: Automatically remove ".DS_Store"
HWMonitor
2.3.20
FREE
HWMonitor displays on your menu bar your CPU and HDD temperature.
EasySIMBL
1.7.1
FREE
Simplified, easier-to-use version of SIMBL.
Chameleon SSD Optimizer
0.9.9
Optimization tool for Solid State Drives.
U2Any Disk Cleaner
5.1.16
U2Any Disk Cleaner Pro is a system utility that lets you find large files.
System Lens
2.61
Know which apps are overusing your CPU resources.
Memory Booster - RAM Optimizer
1.3
FREE
This app helps you optimize the performance of your system.
DriveDx
1.8.2
Check the built-in S.M.A.R.T. status of your drive.
MacBooster
7.0
Optimize the performance of your Mac with just a few clicks.
Advanced Mac Cleaner
1.18.3
Improve the performance of your system with just a few clicks.
Commander One
2.2
Free dual-pane file manager for Mac, Finder alternative, FTP client and more.
Memory Clean 2
2.0.7
Boost up the performance of your system with just a few clicks.
MacTuneUp
7.0
It maintains, secures activity and brings your Mac back to its original state.
Cache Out X
6.0
Robust tool that cleans your computer's system, getting to...
SlimBatteryMonitor
1.5
FREE
Free battery status monitor for the Mac.
Bluetooth Firmware Updater
2.0.1
FREE
This app helps you to update your Apple internal Bluetooth modules.
Snow Leopard Cache Cleaner
5.0.22
It maintains the system healthy by automation of common maintenance chores.
ODBC Manager
1.0.16
FREE
The free ODBC administrator for Mac OS X.
FontNuke
1.2.11
FREE
Utility application that removes corrupt or troublesome font cache files.
iTrash
4.1.1
Uninstall apps and delete leftover files from your Mac.
unpkg
4.5
FREE
Not touch system at all except for the folder where the unpacking takes places.
iPulse
3.0.4
System monitoring application that lets you peek at the inner workings of OS X through a clever and visually compact user interface....
Amnesia: The Dark Descent
1.4
Many software titles on Mac OS come with the uninstall directions of simply "Drag the application to the Trash and empty it"....