Amazon is having another one of their free app blowouts. These 6 Fire TV apps have gone Free. Apart from Plex, the other apps offered have never been free before today. These apps are part of a bigger promotion giving away over $115 in Paid Apps, of which these 6 are Fire TV compatible: Plex, Zombie Gunship, Unpossible, Sonic 4 Ep1, Alpha Wave, and Knock-Knock. The promotion is scheduled to end Saturday.