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MythTV is an Open Source HTPC application that is ported to many Operating Systems including, LINUX, Apple OSX, and Windows. It feature many capabilities, however, it is chiefly used for Digital Video Recording. The commercial skipping feature is noteworthy.

Although it is primarily supported on Linux, it is compatible with other viewing systems such as XBMC (via Mythbox app) on an AppleTV.
The best way to learn about mythTV is to look it up on youtube.com.
by gatorback September 27, 2011
a shitty linux pvr for people who can't buy tivo or get one from comcast
I am a stupid linux kid so I built a mythtv system. I record shows on my mythtv.
by evarlast February 23, 2007