Most interesting in System Utilities

Free
Wineskin Winery creates Mac OS X ports/wrappers for Windows programs/games, with an easy-to-use GUI, integrated Wine, X11 and an installer.
Free
LiquidMac uses a particle system to imitate liquid and responds to laptop orientation.
Free
Untethered jailbreak for all iPhone, iPod touch, iPad and iPad mini models running iOS 7.0 through 7.0.6.
Services menu in Mac OS X lets you perform actions on current selection, such as opening URL, sending snippets, and more.
Free
GUI for creating and editing launchd config files for Mac OS X 10.5.

Top rated in System Utilities

MetricTime
Free

Status bar item that converts local machine time to LMT, making metric time easy to access.

Ring Menu Toolkit
Free

Free app that unlocks the ability to close applications on Macs, plus more features.

QC Plugin Manager
Free

This app installs Quartz Composer plugins and fixes any issues.

Deepin Boot Maker
Free

Open source app to create bootable USB sticks quickly & easily.

whereismymouse
Free

Quickly and easily locate your mouse cursor on multiple screens.

dropboxtool
Free

DropBoxTool permits users to add any folder (symlinks) to the default DropBox folder to be synched like any other resource already present.

Notes+
Free

Notes is a beautiful, quick and easy note taking app.

Torrent Updater
Free

OS X program for finding new torrents on trackers.

SPOT Device Updater
Free

App to update firmware and settings for SPOT Trace.

Thermobar
Free

Thermobar now works with dark mode, allowing you to control and monitor multiple Nest thermostats from your Mac's status bar.

Brightness+
Free

Brightness is an app that lets you customize your display colors for low light conditions, like night.

Simplicity Studio
Free

Simplicity Studio provides tools, docs, software, code libraries and product selector to quickly develop MCUs.

Switcheroo
Free

Slim taskbar for Mac that replaces the Dock and hides background programs, supports drag-and-drop, and has launcher items, Aqua themes, and more.

Computer Glasses II
Free

Computer Glasses II magnifies a portion of the screen to read fine print or images, with adjustable magnification and width.

CocoaMSX
Free

Open source MSX emulator for Mac OS X with support for ROM, DSK & CAS files, plus video effects such as scanlines and signal noise.

ShowsDesktop
Free

ShowsDesktop hides all running apps with one click, revealing a clean desktop.

PowerBlock
Free

PowerBlock intercepts and runs AppleScript when power button is pressed, allowing you to shutdown, restart, sleep, or eject a DVD.

Autodesk 3D Print Utility
Free

The Autodesk 3D Print Utility helps optimize 3D models for printing on MakerBot Replicators, Objet Connex 500, Alaris 30, and more.

The Touch
Free

The Touch program lets you use gestures on Mac to control sliders and pucks with fine or quick movements.

HardwareNotifier
Free

Hardware Notifier uses Notification Center to alert users when USB devices are connected/disconnected.