If you have a big library of medias and want a nice way to display them instead of viewing them in a simple file manager, kodi might be what you are looking for.
What this software does is looking through a specified media folder and searches every file name on a database (such as tmdb for movies) and creates a nice library. Although, you will have to keep them relatively well organized and named with specific rules : “name of the media (year)”. You can read the kodi wiki for more details.
The power of kodi is its great customizability through skins and addons.
Skins can support posters, artworks, coverarts, discarts, fanarts to bring your library to life !
Addons can let you watch movie trailers from youtube in Kodi, watch movies from an online database etc… And if you don’t find what you want, you can always join the developpers and create your own addon/skin !