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If you need to get a structured list of the directories in a folder, TextWrangler can do that.
If you need to access a file or two on a remote server running SSH, then you can use TextWrangler's FTP browsing features to quickly do this.
Bare Bones' TextWrangler is a very useful tool for Web developers, but lacks options for quickly previewing HTML code in your Web browser.
Accessing a hidden folder from within an application may be tricky, but can be overcome using a simple Finder trick.
While OS X includes some robust tools for troubleshooting, there are a number of third-party tools that can help tackle problems or simply give you a better understanding of how OS X functions.
If needed, you can reduce Dock clutter by hiding the icon for persistent background and helper applications.
You can make your own filters for reducing or otherwise adjusting images when exporting in OS X's Preview application.
Apple's built-in text editors offer some quick options for locating and revealing line numbers in documents, which can be exceptionally useful when scripting.
An obscure bug is present in OS X Mountain Lion which, if triggered, will result in the program crashing practically every time.
If you are suffering from repercussions after testing the file URL bug in Mountain Lion, then there are several things you can do.