What is DVR, TiVo, and Freevo?
Digital Video Recording, according to the Wiki page, 'is an electronic device that records video in a digital format to a disk drive, USB flash drive, SD memory card, SSD or other local or networked mass storage device'.
TiVo is a digital video recorder (DVR) developed and marketed by TiVo Corporation. TiVo provides an on-screen guide of scheduled broadcast programming television programs. TiVo also provides a range of features when the TiVo DVR is connected to a home network, including film and television show downloads, advanced search, personal photo viewing, music offerings, and online scheduling. It's available in countries such as, Canada, United States, Spain, Australia, etc.
Freevo is an open source HTPC media centre. It integrates PVR / DVR functionality along with music, video, gaming, home automation and more. It is written in python and is primarily aimed at the Linux platform, it is also possible to run on OSX and Windows. Freevo can make plugins that features DVR and TiVo can't do. For example, file sharing, burning media files to CD's and DVD's and viewing streams on the internet. Freevo also provides access to popular services such as YouTube, Flickr, Apple trailers, IMDB, Hulu Desktop and more through integrated plugins.