Tvheadend - Redmine
Kodi - Kodi is an award winning free and open source media player that got its start on the Xbox console.
OSMC - OSMC is a free and open source media center built for the people, by the people.
Android TV - Android TV is a version of Android made for TV's
DVB Dream - DVB Dream is DVB player with many nice and unique features (more below), it supports standards...
PseudoTV - PseudoTV Live is channel-surfing for your media center.