Movist

I have three apps on my Mac for playing movies:
- Quicktime (included in the default install)
- VLC
- Movist

Movist is currently my default video player for everything except wmv files which VLC tends to do better on. But other than that, Movist has quite a few advantages over the other two.

If you have several video files in a folder that are parts of the same clip—such as movie1.avi, movie2.avi, and movie3.avi—Movist will automatically play the next one when the first one finishes. The only caveat is that they have to be named the same with number suffixes.

You can also turn the volume up to 4x the normal maximum. Quicktime is obviously stuck at 1x and VLC only goes up to 2x. This is a boon to laptop users since the smaller speakers aren't very loud to begin with.

It's a solid app and definitely worth a look.