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ZScreen is an open-source screen capture program that allows for region/window/full-screen screenshots. It can FTP screenshots and put the URL in your clipboard in a single keystroke. It supports automatic custom naming conventions with variables. It can also interface with image editing software.

To set up CalDAV support for Google Calendar in Apple's iCal, follow these steps

A small, free plugin for Safari that adds keyword search to the browser’s address bar.

Save, archive and view your iPhone SMS messages on your Macintosh! Syphone is a freeware Macintosh utility for use with Apple's iPhone. The program installs on your Macintosh and does not alter the iPhone in any way. This application lets you view, save, and back up your SMS messages. With Syphone you can now archive and view SMS conversations, including those that have been deleted from the iPhone.

Free Online Screen Recorder

HandBrake is an open-source, GPL-licensed, multiplatform, multithreaded DVD to MPEG-4 converter, available for MacOS X, Linux and Windows. Exports directly into iPhone format.

The swiss-army knife of QuickTime components. Perian is a free, open source QuickTime component that adds native support for many popular video formats.

Powerful high-quality video converter, player, editor for MPEG, QuickTime, transport streams, iPod. And now it is a DivX editor and encoding machine, and even a stream and YouTube downloader. For Mac OS X and Windows

The ultimate one-click solution for doing backups of your GMail account.

Free Desktop Sharing and Remote Control. Establishes connections to any PC all around the world within just a few seconds. You can remote control your partner's PC as if you were sitting right in front of it. Mac and Windows.

Multi purpose launcher and a more advanced and customizable version of windows run. The program originated as I was sick of spending too much time searching for programs through my ever growing windows start-menu, and also I missed a tool that could ease and optimize my daily work flow. There was of course already programs like this available, but each had it's annoyance or missing features or too(!) geeky.

Batch file renamer that supports all common renaming tasks: Find and Replace (including support for regular expressions); Number Sequentially; Change Case; Set Extension; Add Prefix/Suffix; Remove/Insert Characters.

A Free, Open Source System for Helping Track and Recover Lost and Stolen Laptops. Adeona is the first Open Source system for tracking the location of your lost or stolen laptop that does not rely on a proprietary, central service. This means that you can install Adeona on your laptop and go — there's no need to rely on a single third party. What's more, Adeona addresses a critical privacy goal different from existing commercial offerings. It is privacy-preserving. This means that no one besides the owner (or an agent of the owner's choosing) can use Adeona to track a laptop. Unlike other systems, users of Adeona can rest assured that no one can abuse the system in order to track where they use their laptop.

Backup your iPod Music to a folder on your Mac, or a folder on another iPod.