My file incinerator, a utility that incinerates files that are selected from the users hard disc, is in the process of being converted to Cocoa in Mac OS X. Yes, this means eventually a Mac version will be available for download.
However, I really should note that it is a GUI only. The actual code that incinerates the file is not quite working yet, so it will take some take to successfully port it.
I was pleasantly surprised at how OS X handled the majority of the low-level tasks like the Spotlight and About box. Xcode, Apple's official development environment, does a good job setting the low-level stuff up for you so you can work on bigger and better things.
click here to download a ZIP file containing the app. Because it is not signed with a developer certificate (I am not yet a member of the OS X developer program), it will not work under Mountain Lion under the default security settings. Control-click the app, and then click Open, to grant the app a one-time security exemption.
You can install it globally to the Applications folder on the root of your hard disc, but if you have a personal Applications folder in your home directory, you can install it there so other users don't use a beta program.