Essential Mac OS Software, Tips and FAQ's:

The tips, hints and FAQ's are useful to any Mac OSX user, but the trouble with software today is there is way too much of it. How do I know what's great (or essential) for me? Everybody is going to have their own particular tastes.

What I'm going to try to get out of this (if possible) are applications that are:

Free - yes, I admit it, when it comes to personal software, I'm a bit of a cheapskate.
Are recommended by more then one person.
available on other platforms (like Unix and Windows) as well. They would have preference over Mac-specific ones (although I'm expecting some of those as well).

(Via Sun Bloggers.)