BeatBox is described as 'A music player with focus on speed, simplicity and music discovery' and is an app in the Audio & Music category. There are more than 50 alternatives to BeatBox for a variety of platforms, including Windows, Linux, Mac, Android and iPhone. The best alternative is VLC Media Player, which is both free and Open Source. Other great apps like BeatBox are foobar2000 (Free), AIMP (Free), Clementine (Free, Open Source) and MusicBee (Free Personal).
VLC is a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols. Features Simple, fast and powerful media player.
foobar2000 is an advanced freeware audio player for the Windows platform. Main features Supported audio formats: MP3, MP4, AAC, CD Audio, WMA, Vorbis, Opus, FLAC, WavPack, WAV, AIFF, Musepack, Speex, AU, SND... and more with additional components.
Freeware Winamp-like media player, based on BASS audio library with support for large number of formats and playlists. It works with multiple playlists immediately (tabbed window), allows creation of bookmarks and also has a playback queue.
Audacious is an advanced audio player. It is free, lightweight, based on GTK+, runs on Linux and many other *nix platforms and is focused on audio quality and supporting a wide range of audio codecs. There is also support for several visual styles from Winamp.
DeaDBeeF is a lightweight graphical music player created for easy playback of music and management of playlists. It supports major audio codecs and tags, global hotkeys, gapless playback, streaming audio, command line control, and has an 18-band equalizer.
Quod Libet is a Gapless GTK+-based audio player written in Python. Its designed around the idea that you know how to organize your music better than we do. It lets you make playlists based on regular expressions (dont worry, regular searches work too).