Most interesting in System Optimization

Free
It delivers hardware diagnostics, drive repair and daily maintenance.
A program for monitoring your Wi-Fi network strength.
Free
Provides MacOS users a way to run X Window applications.
It is designed for mutiple audio tasks:record live performances.
Free
Magican helps you improve the performance of your Mac.

Top rated in System Optimization

NaViSet
Free

Control your display settings with ease and precision using NaViSet.

Finderfresh
Free

Refreshes contents of Finder windows at a specified interval.

Plug Tools
Free

Can help you figure out which of your Pro Tools plug-ins are out of date...

Air Mic
Free

Air Mic Live Audio allows you to listen to the live audio stream.

DoktorKleanor
Free

DoktorKleanor for Mac is radically different from other existing system tools.

MacSSController
Free

Make your Mac to start/shut down/sleep on schedule.

WebGrab-FF2
Free

WebGrab-FF2 checks FrameForge site for updated versions of FrameForge 3D Studio for Mac.

memTools

The premier Mac OS X memory management system.

Data Jar
Free

A data store for Shortcuts, allowing you to persist key-value pairs.

TheStartupManager
Free

Remove with ease unwanted Apps from running at login.

Desktop Dimmer
Free

Control the brightness levels on multiple displays.

Cleaner Alpha
Free

Search for junk files that take valuable disk space.

VolumeManager
Free

Holds a list of volumes and automatically mounts them whenever you want.

iMessage Fixer
Free

Reset your iMessage settings if the app doesn't work properly.

Ground Zero
Free

Return an app to the state it was when it was first installed.

Create File Menu
Free

Easily create new files with an extension for Finder.

Stat Menubar
Free

Monitor your computer performance in the menu bar of your Mac.

Speedup Mac Pro
Free

Keeps your Mac running smooth, fast, and error-free.

iLove Browser Cleaner
Free

Cleans caches, cookies, and extensions that slows down your browser.

WeCleanse
Free

Clean useless files on your Mac and improve system performance.