I am looking for a good HDR programme to use on my apple computer, preferably a free programme but am prepared to pay if programme is worth it
I've always been quite happy with the results from HDRtist. It's a very simple, free app with not a lot of configuration options, but it produces punchy, saturated images. It is by no means a replacement for Photomatix or any professional piece of software, but it does a decent job for shots that are just going to be posted to the web.
Photomatix seems to be the de-facto choice for commercial HDR software, though I've found that somewhat like Luminance, the images it produces take work in the GIMP or Photoshop to get right, though the images are better than what Luminance produces.
Look at the examples below to get an example of what you can do with HDRtist and Photomatix. The Photomatix images are, I feel, nicer and a bit more subtle, but took a lot more time and effort to achieve. The HDRtist images are pretty much straight out of the program, except the selective colouring in the second image, which was done in the GIMP.
The following two images were processed with HDRtist + GIMP (only for the selective colouring in the second image):
While these two were processed using Lightroom + Photomatix + Photoshop:
Photomatix would be my first choice. http://www.hdrsoft.com It gives you a simple interface step-by step, some easy default choices but also a very sofisticated control panel if you are not satisfied with the default styles. I always get superior results comparing to Photoshop!