Playback / Audio Library
Most of us use SqueezeCenter and Squeezebox to playback our digital media, but having dedicated tools to playback on the computer and having a good tool to organize and manage your collection can be very important. The wiki already has a (non-tool based) guide to organizing your collection.
The following tools playback and/or organize media on your computer:
+ Freeware and Open Source + Plays all formats that SqueezeCenter can play - No library or organization (uses SqueezeCenter) - Only works with SqueezeCenter
+ Freeware and Open Source + Supports several file formats + Highly customizable + Supports Tagging + Supports ReplayGain + Supports Transcoding - Beta (under heavy development) - Getting it setup can take a bit of work - Making it look nice is a lot of work
+ Freeware + Probably the best organization tool out there + Has lots of other features like PodCasting and Radio + You can buy music from Apple through it - Does not support FLAC - Can move files around on your hard drive if not setup correctly
+ Freeware (but see below) + Plug-ins for almost all codecs + Can transcode to some formats - Pro version (more features) is CommercialWare
Some people prefer older versions of WinAmp.
+ Good for organizing large collections + Supports several formats including FLAC - TrialWare
+ Freeware and Open Source + Similar interface to iTunes (good for organization) - Beta (under heavy development)