FLAC – Free Lossless Audio CODEC

FLAC stands for Free Lossless Audio Codec, an audio format similar to MP3, but lossless, meaning that audio is compressed in FLAC without any loss in quality. This is similar to how Zip works, except with FLAC you will get much better compression because it is designed specifically for audio, and you can play back compressed FLAC files in your favorite player (or your car or home stereo just like you would an MP3 file.

FLAC stands out as the fastest and most widely supported lossless audio codec, and the only one that at once is non-proprietary, is unencumbered by patents, has an open-source reference implementation, has a well documented format and API, and has several other independent implementations.

Website
Comparisons
Documentation
Download
FAQ
Frontend
Sourceforge
Wikipedia

Freeware
Open Source
DOS / Mac / Unix / Windows

PowerShell Audio – Automate conversions / tagging via command line or scripting

An extensible, multi-format audio conversion and tagging module for Windows PowerShellâ„¢

Download
Primer
List of Cmdlets
Script Examples

Hydrogen Audio Forum
Hydrogen Audio Wiki

Recommended Audio Software

Accuraterip ~ Accurate DAE (Digital Audio Extraction)
AcoustID ~ Identify & Fingerprint Songs
Ampache ~ Freeware streaming music server
Audacity ~ Freeware audio editor & recorder
AudioShell ~ Freeware Windows audio tag integration
AutoFolderPic ~ Freeware automated folder .jpg downloader
BatchEncoder ~ Freeware Audio Encoder Frontend
Boom Audio Player ~ Foobar2000’s simpler sibling
CDBurnerXP ~ Freeware CD and DVD Burner
CUETools ~ Freeware cue file tools
DADA Auto-Rating For Foobar ~ Automatically rate your music
DRC (Digital Room Correction) ~ Advanced equalization
EAC (Exact Audio Copy) ~ Advanced freeware CD ripper
FLAC (Free Lossless Audio CODEC) ~ Open lossless audio format
Foobar2000 ~ Advanced freeware audio player
Foobar2000 @ Customize.Org ~ Skinning Foobar
Foobar2000 @ Deviant Art ~ Skins & themes
foo_discogs = Foobar2000 + Discogs ~ Advanced file tagging
freeDB ~ Set up freeDB access Search FreeDB
KeyFinder ~ Freeware musical key analyzer
LAME ~ Freeware mp3 encoder
MP3 Diags ~ Freeware mp3 file repair tool
MP3Gain ~ Freeware mp3 volume normalization
Mp3tag ~ Freeware metadata tag editor
PlexTools ~ Plextor’s CD ripper
PowerShell Audio ~ PowerShell-driven audio interface
RareWares ~ Freeware audio app & CODEC archive
ReplayGain ~ Advanced gain equalization
ReplayGain & Foobar ~ ReplayGain within Foobar2000
ReplayGain & Foobar under Linux ~ RPG with Wine & Foobar2000
Room EQ Wizard ~ Freeware analysis & compensation filters
RightMark Audio Analyzer ~ Freeware Audio Hardware Analyzer
Sound Hound ~ Name that tune
Sox ~ The Swiss Army Knife Of Sound Processing
VU Meter ~ Freeware Standalone Analog Volume Unit Meter
WinAmp Repository ~ NullSoft WinAmp archive
Windows DirectShow Filters – Use FLAC & OGG in Windows, freeware
WMP Tag Plus ~ Extends Windows tag support, freeware