Free as in FREEEEE!
Download it here: http://www.avid.com/media-composer-first
Most DSLR or MSC video shooters use Adobe Premiere Pro CC or Apple's Final Cut Pro X to edit their footage. Avid's Media Composer has long been the editing suite of choice for TV and movie professionals. Now Avid made a scaled down version of Media Composer: Media Composer First. You can download and use it free.
There are four video and eight audio tracks. Exports are limited to Quicktime H.264 or DNxHD file formats at 1080p resolution and frame rate of 59.94 fps. If you want 4K output this is not for you but you can import 4K!