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.
sourceforge.net/projects/ffmpeg-windows-builds
sourceforge.net/projects/ffmpeg-batch
sourceforge.net/projects/ffmpeg-ios
opensource.com/article/17/6/ffmpeg-convert-media-file-formats
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.
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.
Additional 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.