Quod Libet is a GTK+-based audio player designed for organizing music.
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Pro Easy to use
Despite very good library management capability, Quod Libet is easy to use. The base music player doesn't have too many features, making it a breeze to use. However, if you want to go deeper you can install plugins. These plugins can sometimes add complexity, but it's up to you what you do or don't want.
Pro Great for organizing and editing large collections
Quod Libet gives the user the necessary tools to edit and organize their library from within the app. There is support for tags as well to help you quickly find the music to fit your mood. To help you sort through large libraries, you can use the filters which help filter by genera or other search perimeters.
Pro Lots of plugins available
Quod Libet offers many plugins including Last FM sync, lyrics support, and iOS sync.
Pro Folder view
Quod Libet has multiple viewing modes, including Folder (File System) hierarchy view. The only other program to have a good folder view would be Sayonara.
Pro Powerful search syntax
Quod Libet has powerful search syntax options, which are very useful for creating smartlists or querying a big music collection.
Pro Customizable looks
There are a few controls that allow the user to change how the player looks.
Pro Fast & Small
Fully functional and takes up little space on the hard drive.
Pro Built-in Soundcloud support
Pro Integrates with IoT / home audio
Sonos, Squeezebox, ...
Con Rhythmbox clone
Can't find many differences with Rhythmbox.
Con GTK app
It will need a bit more of resources in a non qt environment.
Con Doesn't support playlist files
Con Plugins could be better integrated
Lyrics are not downloaded automatically in Quod Libet, while simply viewing lyrics could be made a lot more accessible. There is also little information pulled from last.fm - scrubbing works, as well as there being no artist info or suggestions for similar artists.
Con Uses quite a bit of memory
Quod Libet can use up to 130 MB.
Con The GUI could have more eye-candy
There aren't any icons within the GUI, just text. This makes it feel more like a library management tool than an audio player. A little polish would go a long way here.