Continuing the leftfield choices, we've plumped for PotPlayer over VLC for those times when you just want to play some media without going through the rigmarole of adding it to Plex's library. Why? Well, we've found it to be slightly more stable than recent versions of VLC, and it comes with numerous codecs as well as OpenCodec support for those more obscure files.
PotPlayer is overflowing with cool features to make your viewing experience absolutely perfect, too – we're impressed with its wide range of filters, which can clean up murky video rips (or compensate for dodgy monitors) rather nicely. PotPlayer is also clever enough to analyse filenames and automatically pick up the next episode if you're watching a TV series. Just make sure you name your files appropriately.