GCstar is a free open source application for managing your collections. Detailed information on each item can be automatically retrieved from the internet and you can store additional data, such as the location or who you've lent it to.
GCstar vs Media Companion opinions
GCStar is designed to handle various collections whereas MC handles specifically video collections for the Kodi platform.
It is not a "media manager" for Kodi
tinyMediaManager is a media management tool written in Java/Swing. It is written to provide metadata for the Kodi Media Center (formerly known as XBMC), MediaPortal and Plex media server.
MediaElch is a MediaManager for Kodi. It directly accesses XBMCs database (SQLite and MySQL) and thumbnail cache to store information about movies and TV shows.
Ember Media Manager is just that: a media manager. Once configured, it let's you fetch, store, and view various details about your media collection. Movies and TV shows are the type of media that Ember can handle.
Numento is a elegant collection software fully customizable that will let you freely choose your method of management. Manage your library (Books,CD, DVD, comic books, games), your coins, your stamps, your postcard, etc.This app doesn't have any features at the moment.
ViMediaManager is a media manager for Mac OS X, allowing you to gather, store and manage the information and extra images for your movie, television & anime collections, and can be used on it’s own, or in combination with XBMC, Plex & YAMJ.This app doesn't have any features at the moment.
Yammm runs as a Windows Service and will download meta data, artwork, rename folders, rename files and\or create playlists. Metadata can be any combination of dvdid.xml, mymovies.xml and\or XBMC nfo file. All meta information and artwork is provided via either themoviedb.