WMA to Wave Audio command-line converter / decompressor.
http://muldersoft.com/#wma2wav

A complete, cross-platform solution to record, convert and stream audio and video. FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. It supports the most obscure ancient formats up to the cutting edge. No matter if they were designed by some standards committee, the community or a corporation. It is also highly portable: FFmpeg compiles, runs, and passes our testing infrastructure FATE across Linux, Mac OS X, Microsoft Windows, the BSDs, Solaris, etc. under a wide variety of build environments, machine architectures, and configurations.
ffmpeg.org
DVD-Audio Decoder input plugin and Watermark Detector / Neutralizer DSP plugins for Foobar2000. Decoder is capable of playing back DVD-Audio discs, ISO images, AOB, MLP and Dolby TrueHD files in full resolution. Dedicated plugin for DTS-HD playback. APT-x100 plugin for *.AUD and *.AUE files from DTS movie / trailer discs.
sourceforge.net/projects/dvdadecoder
FAAD2 is an open source MPEG-4 and MPEG-2 AAC decoder, it is licensed under the GPLv2 license.
www.audiocoding.com/faad2.html
faac.sourceforge.net
rarewares.org/aac-decoders
en.wikipedia.org/wiki/FAAC#FAAD2_decoder
This component displays several groups of items which are described in the following sections. The item names are displayed in upper-case letters in the UI element, but can also be used in lower-case in title formatting code, since field names in title formatting are case-insensitive.
Super Audio CD Decoder input plugin for foobar2000. Decoder is capable of playing back Super Audio CD ISO images, DSDIFF, DSF and DSD WavPack files. Direct DSD playback for compatible devices.
Separate DSD Processor/DSD Converter plugins for track extraction into DSD/DST encoded files.
sourceforge.net/projects/sacddecoder
Foobar2000:Components/Super_Audio_CD_Decoder_(foo_input_sacd)
Sony: How to install a Super Audio CD Decoder component
Additional encoding/decoding and input components expand the range of audio file formats that can be played by Foobar2000. Not all of these components are official or officially recommended. Listed alphabetically by component name.
foo_hdcd ~ This post processing service component will decode HDCD data in any 16-bit PCM stream passed through it by supporting inputs, such as CDDA, WAV, FLAC, and WavPack.
Command-Line Decoder Wrapper ~ This component allows foobar2000 to play or convert any audio format with a standalone command-line decoder available, including various exotic formats that do not have native foobar2000 decoder components. (foo_input_exe)
FFmpeg Decoder Wrapper ~ This component allows foobar2000 to read arbitrary file formats via user-supplied ffmpeg.exe and ffprobe.exe. (foo_input_ffmpeg)
foo_dyndec ~ Exposes the decoded sample rate, number of channels and bit depth to components that can only use static information natively.
foo_input_dummy ~ a pseudo input
FLAC Frontend is a convenient way for Windows users not used to working with command lines to use the official FLAC tools. It accepts WAVE, W64, AIFF and RAW files for encoding and outputs FLAC or OGG-FLAC files. It is able to decode FLAC files, test them, fingerprint them and re-encode them. It has drag-and-drop support too. It is tested on Windows XP SP3 and Windows 7, but should work with Windows XP SP2 or newer. It requires .NET 2.0 or later.
A Mac OSX GUI frontend for open source audio codecs. There is an older Windows version available as well.

MAD is a high-quality MPEG audio decoder. It currently supports MPEG-1 and the MPEG-2 extension to lower sampling frequencies, as well as the de facto MPEG 2.5 format. All three audio layers — Layer I, Layer II, and Layer III (i.e. MP3) — are fully implemented.
MAD does not yet support MPEG-2 multichannel audio (although it should be backward compatible with such streams) nor does it currently support AAC.
MAD has the following special features:
- 24-bit PCM output
- 100% fixed-point (integer) computation
- completely new implementation based on the ISO/IEC standards
- available under the terms of the GNU General Public License (GPL)
www.underbit.com/products/mad
sourceforge.net/projects/mad/files
WavPack is a completely open audio compression format providing lossless, high-quality lossy, and a unique hybrid compression mode. For version 5.0.0, several new file formats and lossless DSD audio compression were added, making WavPack a universal audio archiving solution.
In the default lossless mode WavPack acts just like a WinZip compressor for audio files. However, unlike MP3 or WMA encoding which can affect the sound quality, not a single bit of the original information is lost, so there’s no chance of degradation. This makes lossless mode ideal for archiving audio material or any other situation where quality is paramount. The compression ratio depends on the source material, but generally is between 30% and 70%.
The hybrid mode provides all the advantages of lossless compression with an additional bonus. Instead of creating a single file, this mode creates both a relatively small, high-quality lossy file that can be used all by itself, and a “correction” file that (when combined with the lossy file) provides full lossless restoration. For some users this means never having to choose between lossless and lossy compression!
WavPack employs only well known, public domain techniques (i.e., linear prediction with LMS adaptation, Elias and Golomb codes) in its implementation. Methods and algorithms that have ever been patented (e.g., arithmetic coding, LZW compression) are specifically avoided. This ensures that WavPack encoders and decoders will remain open and royalty-free.
www.wavpack.com
github.com/dbry/WavPack
en.wikipedia.org/wiki/WavPack