Darwin 9: New Release

As you know Mac Os X is based on a Free BSD, the distributtion is called Darwin. The Darwin version of Leopard is Darwin 9, You can donwload and isntall it from the next link: Darwin's Versions

The User Interface of Mac Os X is private, but if you want to view the core code you can do it downloading the source code.

Also there are a lo of Open Source by Apple, like the Video Streaming Server, Bonjour technology and more. Apple Open Source

Dashcode : First Impresions

First Impressions About Xcode Developer Tools 3.0

Dashcode: Very amazing and easy development way to Widgets.

There are a few of templates:

Navigation menu with objects hierarchy

You can add objects with drag and drop.

Establish break points in JavaScript Code. Very usefull. Because JavaScript is an interpreted language program, not precompiled, and you can do a lot of coding mistakes.

The Dashcode app is in the Leopard installation DVD, you can also download it form the developer site of apple, with the XCode 3, installation image. You must to register as developer.

You can download a widget to read the rss of appleresearch, was made with a template about in five minutes or less :)