jobberBase is an open source job board software extracted from the successful Romanian IT job board jobber.ro. The design of jobberBase is very clean, simple and easy to use. It has some popular features of modern job boards which includes Post jobs without an account, Search for jobs, Apply to jobs, RSS feeds of latest jobs and Site-widget which can be places on other websites for displaying current jobs.
Most importantly, You can use jobberBase free of charge, for anything you like (including commercial applications). You only need to keep the copyright and license remarks.
But I figured out that there is one drawback. User have to post the job under specied category as display on tab. So if you to post other jobs too, the solution would be if you specified "Other" category to let user to post other kind of job. I'm still looking company who have implemented this software for their needs. Am hoping the documentation team will guide the developer to extend the functionality of this software.