PlexEditor is described as 'Faster editing than the Plex Media Manager Edit the movie Title, Title Sort, Title Tag, Content Rating, Year, Summary, Genre & Collection fields Sort the recordset by Title, Year, Date Added or Content-Rating Manage your movies Genre and Collection Tags Assign Tags to' and is a Media Manager in the Video & Movies category. There are seven alternatives to PlexEditor for Windows, Mac, Linux and Self-Hosted solutions. The best alternative is tinyMediaManager, which is both free and Open Source. Other great apps like PlexEditor are MediaElch (Free, Open Source), Ember Media Manager (Free, Open Source), Media Companion (Free, Open Source) and Media Center Master (Free).
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.
Media Companion is the original free to use Movie/TV Show manager and organizer that offers full XBMC integration. Simply put, Media Companion gathers information from the Internet and make this information available to you in an organized manner.
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.