SMPlayer Portable is a free and open source video playing application that's portable.
Here are some screenshots to illustrate the features and user interface of this application:
A free (gpl) Video program for Windows. Screenshot of SMPlayer Portable - 701px · 556pxFree Media Player with built-in codecs. Play all audio and video formats. Screenshot of SMPlayer Portable - 701px · 556pxSMPlayer Portable: Free media player. Screenshot of SMPlayer Portable - 701px · 556pxMedia player with built-in codecs that plays all audio. Screenshot of SMPlayer Portable - 701px · 556pxSMPlayer Portable: User interface. Screenshot of SMPlayer Portable - 701px · 576pxScreenshot of SMPlayer Portable - Size: 701px · 556px