As you may know, Davinci Resolve light is out for mac. It is a free version of Davinci Resolve 8 with a few limitation.
From the website :
DaVinci Resolve Lite – Free
The free DaVinci Resolve Lite includes the same high quality processing as the full DaVinci Resolve, however it limits projects to SD and HD resolutions, two color correction nodes, a single processing GPU and a single RED rocket card. Stereoscopic 3D features, 2K, noise reduction, power mastering, remote grading and sharing projects with an external database server are features only offered in the full DaVinci Resolve and are not included in this free DaVinci Resolve Lite edition. Download Now!
Only issue though the interface is only optimized to work with a resolution of 1920×1080. So if you are playing with it on you MacBook Pro, you might not be able to see the whole thing. So here is a small workaround you can do
type : defaults write -g AppleDisplayScaleFactor 0.80
When you are finish to play with Resolve jus type the same thing in terminal but set the value to 1.0 instead of 0.80.
NB: you can set any value you want instead of 0.80