TOMAHAWK is a cross platform social music player that plays local music files as well as integrates streaming services.
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Pros
Pro Innovative music inbox
Pro Familiar interface
TOMAHAWK uses a familiar panned interface that users have become accustomed to within other music players.
Pro Plays from online third-party sources
You can connect Tomahawk with Spotify, Google Play Music, Last.FM, YouTube, Soundcloud, and a lot of other online sources. This means you have instant access to virtually any song you could ever want - even remixes (especially on YouTube) from this one program.
Pro Beautiful Design
TOMAHAWK has one of the best modern design
Cons
Con Cover songs show up in mixes
Amateur cover songs have a habbit of finding their way into mixes which means TOMAHAWK has trouble telling the difference.
Con Buggy
Not stable.
Con Lacks some polish
While listening to music, the music area doesn't scroll along with the music. Also, some of the plugins are slow to respond and they each provide a slightly different experience with which information they show, and how they show it (there isn't a standard format).
Con Development seems to have stalled
This project's github readme.md states that the project is abandoned, although some people appear to be contributing still.