What about all the movies already on your computer, all those DVDs you’ve been backing up for years (for personal use of course)? No problem, just get Plex. Once you install the free media streamer on your computer or NAS, it’s a snap to stream all of those to your big-screen TV, and they’ll be gorgeously organized too. The Roku channel has a free 30-day trial, then it’s a one-time fee of $5. Optionally springing $30 a year for the premium Plex Pass plan unlocks a slew of features, including high-definition trailers, interviews, and extra goodies for every movie in your library. (Plex Pass also comes with one free app, so you could skip paying $5 for the Roku app, or grab one of the mobile apps, which usually cost $5 as well.) Now if only Roku would give Plex a pass on the cookie-cutter interface.