Prefpane extension that offers a bunch of handy scripts for getting, say, the next 7 events in your calendar and displaying them on your desktop.

Another open source image editor for pixel art.

Indie keyframe-based animation software that outputs HTML5 markup (mostly divs and CSS3). Icon artwork by Susan Kare.

Installers for versions of Git. That's just nice.

The best way to communicate visually, quickly. And it keeps getting better.

Apache, MySQL, PHP in a box.

Still that good.

The closest thing to controlling the computer with your mind.

Totally indispensable tool for pixel-precision.

Compress everything easily without loss of quality.

(Now deprecated) SourceForge site for Open Emu. The download link works, though.

Github for aforementioned open source game emulator software

Cocoa port of sfxr

Open source Mac OSX code editor. Style syntax and editor chrome with CSS. Use JS for behavior.

All the goodness, none of the evil.

What it says on the tin.

Jon Hicks weighs in. Opacity, despite it's cheap icon is the most worthy of the bunch. Pixel-snapping, bitmap effects, vector editing and really great exporting. I sure wish Drawit had more features. What a nice interface.

GUI for LESS CSS compiler. You can switch on auto-compile so it will run whenever you save the .less file.

Make any cocoa app full-screen

Vector drawing app. Lets you export as source-code to Cocoa, Cocoa Touch or Javascript/Canvas.

The blog post

An OSX command line tool for generating pristine images for text replacement.

An OSX command line tool for generating pristine images for text replacement

Full class notes, syllabus, from Stanford's iPhone dev class.