Nightingale!

foobar2000 is an advanced freeware audio player for the Windows platform.

Clementine is a cross-platform free and open source music player and library organizer. It is a port of Amarok 1.4 to the Qt 4 framework and the GStreamer multimedia framework, focusing on a fast and easy-to-use interface for searching and playing your music. It is available for Unix-like, Windows and Mac OS X.

Manage your music as a library, as playlists or as folders on the file-system. Organize, browse and find music on your computer, on portable devices and on the web. Small or large collections are handled with ease.

MediaMonkey is a music player and a music library manager with support for 50,000+ files and many features for organizing, tagging, converting and burning your music. It also has advanced podcasting and syncing features. MediaMonkey syncs with iPhones, iPods, and most other MP3 Devices. MediaMonkey is an All-in-One music manager solution with many plugins available.

Rhythmbox is an audio player for Linux that plays and organizes digital music. Inspired by Apple's iTunes, it is free software that is designed to work well under the GNOME Desktop using the GStreamer media framework.

Amarok is a powerful music player for Linux, Unix and Windows with an intuitive interface. It makes playing the music you love and discovering new music easier than ever before - and it looks good doing it!

Play your music and videos. Stay entertained and up to date with podcasts and video podcasts. Discover new music with Last.fm radio. Sync your G1 phone, iPod, and other devices.

Miro (formerly Democracy Player) is a free and open source internet TV application, media library, and video player.

A tiny and portable audio player. With a size of about 280 KiB it plays OGG, MP3, audio CDs, WMA and several less used formats like XM, IT, MOD, UMX and others. Furthermore it supports a wide range of plugins, skins and visualizations, works with tags, creates media library from existing music etc.All from the people beyond the "BASS audio library" which is even used by commercial PC games like Audiosurf.

JetAudio is integrated, multimedia software made of a single compact rack. Not only does it play various music and video files, it also has features such as CD burning, recording, and conversion to other file formats. You can create your own Internet broadcast by using JetCast, provided with JetAudio, and you can play all major file formats, including WAV, MP3, MP3Pro, OGG, WMA, MPEG, AVI, WMV, MIDI, RM, and video and audio CD tracks.

Easily play and manage your music and playlists with Groove. Add your songs to OneDrive, and Groove brings them to all your favorite devices. Want more ways to play? Get a Groove Music Pass and dive into artist-based radio, curated playlists, and one of the biggest music catalogs on the planet.

RealPlayer with RealTimes (aka “RealPlayer” for short) still includes the legacy features, such as Video Player, Downloader, Converter, Organizer and Web Videos. It also includes RealTimes features, such as Photos and RealTimes Stories, the automatic video collage feature.