XBMC Media Center is a free and open source cross platform media player application developed by the XBMC Foundation. Recently they had announced the development of XBMC for Android. But even before the official release, a leaked version of XBMC for Android has surfaced. We are not sure if it an early development build or a beta version. So expect some bugs in this version.
XBMC has also announced that the version they will be releasing would be a full fledged client, so expect some great features.
The leaked XBMC APK can be downloaded from here.