Essential software that every Mac OS X user should have.

Salling Clicker

Salling Clicker utility to remotely control applications on your Macintosh computer with a mobile phone or handheld computer.
My Salling Clicker Scripts

MobileSync

Synchronization application lets you take most of your personal information with you--no matter where you go--by keeping Entourage and your Sony Ericsson phone's calendar and contacts up with each other's changes.

Konfabulator

Konfabulator is a JavaScript runtime engine for Mac OS X that lets you run little files called Widgets that can do pretty much whatever you want them to

Adium X

Adium X is an instant messaging client for Mac OS X. Adium supports multiple protocols, allowing you to communicate on many services from within a single application.

Life Balance

Life Balance is award winning coaching software that provides a dynamically ordered To Do List driven by the importance of your goals, your desired allocation of time and effort, and feedback from what you get done each day.

VLC

VLC (initially VideoLAN Client) is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, ...) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.

Synergy

Menubar control interface for iTunes.

PithHelmet

PithHelmet adds some some basic but powerful content filtering to Apple's Safari browser. The basic purpose is to block ad images, but there are other potential uses as well (blocking Flash, Shockwave or horrible midi loops).