SMPlayer intends to be a complete front-end for MPlayer, from basic features like playing videos, DVDs, and VCDs to more advanced features like support for MPlayer filters and more. It is a free and open source AVI playing application that's well-designed, light on system resources, easy-to-use, modern and minimalistic.
Here are some screenshots to illustrate the features and user interface of this application:
MPC-BE
Twitch Desktop App
DivX Web Player
PotPlayer
GOM Player