any recomendations for a free photo editing app for a mac mainly for raw files a bit of sharpening cropping etc, i am using canons dpp at the moment and was wondering if there is anything better

GIMP works – but takes time to learn and is a bit clunky.

Just pay for Lightroom, it’s not that expensive.

iPhoto does the basics and is free on a mac?

capture one. image quality is usually better than the manufacturers own and much better than the adobe colour engine used in lightroom/photoshop. has a fair few lens profiles too.

Not free, but not expensive – Affinity Photo…

https://affinity.serif.com/en-gb/photo/

iPhoto is not long for this Earth, having been replaced by Photos. I believe Photos does support RAW format though.

Rawtherapee is free, and can do a lot of stuff for RAW files, though maybe takes time to learn. http://www.rawtherapee.com/

Also Lightzone looks interesting, though not used it much myself. http://www.lightzoneproject.org/

Acorn is another you could try

thanks a few to have a look at

Darktable (Linux light room basically) is also worth a look and is fully Mac compatible.