Auryo
Auryo – free and open source cross platform unofficial beautiful SoundCloud client for your desktop
GPMDP
Google Play Music Desktop Player a unofficial beautiful cross platform Desktop Player for Google Play Music
gPodder
gPodder is a simple, cross-platform free and open source podcast downloader, player, and sync tool
GNOME Podcasts
GNOME Podcasts – free and open source desktop podcast client has a simple and straightforward UI
Kaku
Kaku – free and open source music player supports different online platform like YouTube, SoundCloud, Vimeo and more
Poddr
Poddr – free and open source podcast desktop client, podcast aggregator, a application for searching, listening, and managing podcast subscriptions
Vocal
Vocal – free and open source powerful, beautiful, and simple audio or video podcast client
Picard
Picard – free and open source cross-platform music tagger/audio tag editor that helps in identifying and organizing the digital audio
Kid3
Kid3 – free and open source cross-platform audio tag editor for many audio file formats
EasyTAG
EasyTAG is a simple free and open source application for viewing and editing tags in audio files and works under Linux or Windows