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HexEdit is an open source hexadecimal editor for Mac OS X. A hex editor allows you to view and modify any kind of file. (Not that you’d necessarily want to edit ANY kind of file — that could be dangerous.) But there are times when a hex editor is the only tool for the job. For instance, there are several hints from macosxhints.com that require a hex editor.

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Why do we like Macs? “We just do.” Also, they rarely breakdown. But if you experience disk trouble, AppleJack can help. It’s the Mac freeware we hope you never have to use.

Once installed, AppleJack is accessible from the Single-User Mode command prompt. (Hold down Apple-S while booting.) AppleJack can repair your startup volume, repair permissions, cleanup cache files, and validate preference files. It has a simple text menu so you don’t have to remember commands.

Also see the Macfixit article on AppleJack and read the cautions.

This could be a life saver in case of trouble.

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Wimp is a very simple program which helps you keep tabs on your computer’s ip address. Wimp runs a small program in the background which sends an e-mail to the address of your choice whenever the ip address changes.

As you would imagine, this can be quite useful for controlling a Mac remotely. I have this running on my Mac at home. When the ip changes, I get an email to the account on my Powerbook. I have a rule set up in Mail.app to take the email and file it away immediately. That way, I never see it. Then, when I need to know the latest ip, I go into my archives folder and find the most recent email.

This could also be useful if your computer gets stolen. It would keep track of the location of your Mac and may be able to help you find it. If the operating system was re-installed, of course Wimp would be erased. But, who steals your laptop and then looks around for your install cds? (Note To Self: Take install cds out of laptop bag.)

(This app seems to be missing. If anyone knows a similiar app, please let us know.)

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Rember is a front-end GUI to the ‘memtest’ command line memory testing program. This will allow the user to select the number of test loops, as well as the amount of memory to test. There is a ‘Log’ tab that will allow the user to monitor memory testing. The user can toggle a ‘verbose’ switch to limit the amount of output. Allows user to quit Finder and other applications.

As you would expect, this is quite a useful tool.

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This isn’t for the faint of heart, but Fink brings the world of open source to your Mac. Specifically, it allows you to pick from among hundreds of software packages that have been “ported” to Mac OS X from UNIX and Linux.

Linux operating systems usually offer some sort of package management command such “apt-get” or “yum”. Fink provides this same functionality for Mac OS X users in Terminal. You could use Fink to install MySQL, PostgreSQL, gnuplot, amaya, and more.

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UnRarX is a great tool to have around. As the name would suggest, it will help you to expand rar archives.

I think that most Mac owners use Stuffit Expander for rar archives, but UnRarX has helped me when Stuffit Expander couldn’t do the job.

Next time you you can’t open up a rar archive, remember this post and come on back for UnRarX. (Or download it now and save yourself the trouble.)

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Here’s another UNIX utility, but this one is also for people that thought Terminal stuff wasn’t for them. CLIX (”Command Line Interface for Mac OS X”) is a GUI front end for UNIX commands. It comes with over 1000 commands so you can perform many tasks that are only available through the Terminal. For example, you can delete the browser history of all your browsers with just one command.

Advanced users can modify or write their own commands and save them as libraries of commands. Then just double click a task to run it.

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Whenever you create a new user account, you’re asked to provide your full name and a “short name”. The short name ends up being the name of your home folder and an internal identifier for your account. Unfortunately, the short name can’t be changed through System Preferences like other account information. But ChangeShortName can do it for you. So if in the excitement of installing your new Mac you ended up with a short name you now regret, use this freeware app.

*Be sure to read the included instructions since this is a pretty big deal for your system. As always, backing up your Mac is a good idea.

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If you have ever wanted to personalize your Mac, Tweak Freak will probably allow you to do it. It gives you options with the dock, more with Unix, changes with Finder. (The freeware will allow you to add a “Quit Finder” to the Finder Menus…allowing you to squeeze out the last bit of CPU when you are rendering movies and need every last drop.)

Take a look on the site for more examples, then launch the program to triple the list. (You’ll find Tweak Freak at the bottom of the list.) There is a lot of power, and very simple to use all of it.

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iTerm is the muscly old brother of Terminal.app. If you find yourself regularly opening Terminal to use the UNIX command line, you might like the extra features of iTerm — tabs and bookmarks. The tabs are as easy to use as in Safari — you can open them, close them, and switch between them. iTerm’s bookmarks feature is especially helpful. You can save commonly used UNIX commands as “bookmarks” and execute them simply by clicking. Great app for the UNIX user.