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J-Board is a job board application which anyone can download and install on their website/blog. It's built using PHP/MySQL, and features include listings with microformats, widgets, tag clouds, automatic submission of new listing to social search engines, RSS feeds, a theme system for easy customization, and a language file which makes translation simple.
The application is built to be versatile, so it doesn't have to be used as a job board; in fact, it will do for classifieds, event announcement and similar tasks.
After installing J-Board, you're free to charge users for job listings, or add text advertisements such as AdSense to the board. J-Board comes with a price, though: 30 dollars.