Plex

Plex orginally was a Media Server that made it possible to stream your personal media remotely. While it still provides that service, it has evolved, for better or worse, into a streaming platform of its own. Something akin to NetFlix or Hulu with native ad supported offerings. 

If you have a collection of media (or know someone else with one), Plex enables you to stream all that stuff from a computer or server onto your TV or smartphone. And while you can pay for Plex, a lot of its best features are actually free — as are the movies and TV shows and channels it airs. 

On a personal note, I don't really like "sharing" my media server user interface (UI) with content from another source, even if it is Plex itself. Granted Plex as a media server is excellent, but there are a number of issues starting to pile up since they decided to become a streaming platform themselves.

There are a number of pros and cons for Plex as it is today. Here is my  list:

Plex Pros	Plex Cons
Supports a wide variety of server and client platforms and devices.	Extremely limited UI customization. User interfaces can vary greatly from one platform to another.
Hardware transcoding is excellent	No ability to access your media locally from your Plex server if your Internet is down (DLNA is possible but not practical)
Efficient use and decent monitoring of device resources	No support for eBooks or audio books
Loads of community support	Most of the popular features, such as hardware transcoding, downloads, mobile sync, DVR recording, music lyrics, skipping intros and credits, custom sharing restrictions and bandwidth and transcoding limits require a paid subscription or a lifetime membership.
Supports Live TV and DVR options (we are talking locally, not Plex's own offerings)	Android and IOS mobile apps require a fee
Very good database management and backup options	No ability to grant friends access to your local Live TV unless you make them part of your Home account (which lists them with your home users every time you login)
Regular updates and patches	No ability to change the name of user accounts to human friendly name. You get a truncated version of their email address as a username. (If you use Tautulli you can change it there but it won't show up in Plex that way)
	No ability to "push" the menu (custom UI) you want your users to see on their devices.
	New libraries on your Plex server show up at the bottom of your user's menus. Requiring them to re-pin and change the order of their menus anytime there's a library addition or change.