Top rated in System Optimization

Memory Magic
1.2
Memory Magic monitors your Mac's memory usage and transparently performs optimizations aimed at freeing/relocating memory....
StatsBar - System Monitor
2.6
Easily Monitor Your Mac's System Stats With StatsBar...
UninstallPKG
1.1.6
Completely remove so packages (.pkg).
AutoMemoryCleaner
1.3
FREE
The app is designed to free up the memory of your computer system.
Disk Map
2.5
Disk Map makes it easy to visualize the files and folders that are cluttering up your storage drives....
Mavericks Cache Cleaner
8.0.9
This Mac application helps you optimize your system's performance.
Monity
1.4.5
System-monitoring widget placed in your Today View.
Tweak and Tuneup
2.4
Collection of massive powerful tools to enhance the performance of your Mac.
KnockKnock
2.0.5
FREE
This app helps you find malware threats on your Mac.
Disk Sensei
1.6.3
Check the health status of your disk and boost up the performance of your Mac.
TM Error Logger
4.2.6
FREE
Time Machine error-reporting program.
MacJanitor
1.3
FREE
Free Mac OS X system maintenance tool.
BootXChanger
2.0
FREE
BootXChanger will allow you to change the boot image and background colour on...
iTweak
1.5.3
FREE
This application is a companion for iWeb which facilitates Internet browsing.
Mac Pro SMC Firmware Update
2.0
FREE
Recommended for all Mac Pro (late 2013) models.
Socks
2.0.1
Collection of useful utilities to help clean, troubleshoot, optimize...
HDCleanUp
2.1.3
Easy-to-use disk cleaning utility.
Pro Tools HD
11.3
For the ultimate in audio quality and workflow efficiency, more music and...
CPU Speed Accelerator
8.1
Increase the CPU being allocated to your foreground tools.
Spirited Away
0.7.2
FREE
A small tool that automatically minimizes applications based on a custom delay.
Xupport
3.6.0
Multipurpose system utility for Mac OS X.
CLIX
2.4
FREE
CLIX (Command Line Interface for OS X) is a Cocoa application that harnesses the power of Unix.
UNO
1.6
FREE
UNO
Several ways to skin your Cat..
XRG
2.6
FREE
XRG
XRG (X Resource Graph) is an open-source system monitor for OS X.
Hidden Cleaner
2.1
Simple drag and drop utility that cleans and ejects USB devices like MP3 players...