Batch image converter

Is there a free batch image converter for Max OS X?
I need to convert ORF to JPEG. After some googling, there appears to be no fully fledged software up to the task. I see some tutorials on using Automator, but it seems like hassle and I would appreciate some one click converting softwares

I'd be very surprised if Graphic Converter couldn't do this. It's not free exactly, but something as specialized as this you really should expect to pay the modest donation requested.