Apps similar to RhythmCat include foobar2000, which is free for personal use. Other options are AIMP, Clementine, Winamp and Audacious. There's no shortage of Audio Players like RhythmCat, with more than 50 alternatives for Windows, Linux, Mac, Android and iPhone.
Media player based on Mplayer/FFmpeg technologies. It has a simple interface and many powerful functions:
Album Player (Freeware, Windows XP/Vista/7/8/10) is designed for composing and listening to compilations of music albums on your hard drive and CD/DVD. The Album Player plays audio files of popular formats, such as WAV, FLAC, APE, WavPack, ALAC, AIFF, TAK, MP3, MP4, OGG, MPC...
Russia
jmc is an elegant and bloat-free media player and management app for macOS. It is modeled after early versions of iTunes, featuring a persistent album art view and a functional user interface. The entire interface is geared toward intuitiveness, efficiency, and performance...
With TapTunes, you will experience your music collection like never before. Touch, tap, drag, shake, swipe, pinch ? you've never been this close to your tunes!
United Kingdom
A simple media player for GNOME that supports libvlc, xine-lib and libgstreamer.
MusiMoods is a gorgeous and sophisticated, yet easy-to-use, mood and activity based playlist creator and music player for Macintosh. Simply add your music and select a mood.
United States
Turtle Player is a fully fledged, open-source, Music Player for Android. It's designed with the intention of being fun, unique and simple to use.
Jukebox Star is a free social music video jukebox that allows you to create a free jukebox and let everyone add music to the playlist. You can also check-in to other jukeboxes near you so you can hear your favourite songs anywhere.
An Interactive video player for websites that allows content producers to monetize products/services and engage with viewers on a micro level.
