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Essential reading, or not...

ffmpeg.exe : This is used for MP3 conversion, but it can be used to convert just about anything to anything else. For video processing too.
https://www.ffmpeg.org/about.html

flac.exe and metaflac.exe : For FLAC file handling.
https://xiph.org/flac/

LAME MP3 Encoder : For MP3 conversion.
https://lame.sourceforge.io/

Ogg file format
https://xiph.org/ogg/

FLAC and Ogg codecs : Install these so Matt's Music Player works with FLAC and Ogg files.
Install 'opencodecs_0.85.17777.exe' or later
https://www.xiph.org/dshow/

FreeDB database : The freeDB database was discontinued in May 2020, but...
https://en.wikipedia.org/wiki/CDDB : The original CD database, later became freeDB
freedb.howto.txt : Original freeDB developer documentation
Several servers continue to support freeDB, such as...
https://gnudb.org/

MusicBrainz : Open music encyclopedia
https://musicbrainz.org/
https://wiki.musicbrainz.org/History:FreeDB_Gateway : MusicBrainz no longer supports FreeDB
https://wiki.musicbrainz.org/Development : About the new MusicBrainz API

AcousticBrainz : The acoustic characteristics of millions of tracks. MuMan uses this to get the BPM values.
https://acousticbrainz.org/

GetSongBpm : The largest database of beats-per-minute in the world. MuMan also uses this to get the BPM values.
https://getsongbpm.com/

Discogs : Music database and marketplace. Research, buy and sell almost every CD and album that's ever been produced.
https://www.discogs.com/
https://www.discogs.com/developers : About the Discogs API

Broadcast Wave Format (BWF) Specification : WAV files that can store > 4GB (but still don't support UTF-8?)
https://tech.ebu.ch/docs/tech/tech3285.pdf

RF64 An extended file format for audio
https://tech.ebu.ch/docs/tech/tech3306v1_0.pdf

ID3 Tags in MP3 files : MuMan can read all versions of the MP3 tags (even corrupted tags which other apps cannot read), but it writes ID3v2.2 (ISO or UTF-8 characters) and ID2v2.1 tags (ISO only) to MP3 files which it creates.
https://id3.org/

WavPack file format (.wv) : WavPack is a completely open lossless audio compression format, which also has a 'hybrid' lossy compression mode.
https://www.wavpack.com/

Hydrogenaudio Knowledgebase : A wiki-styled resource containing everything you need to know about audio technology.
https://wiki.hydrogenaud.io/
Here you can find amazing things like the APEv2 information tag specification.

 

Other interesting stuff...

OBS Studio : Excellent free software for video recording and live streaming.
https://obsproject.com/

hifiengine : The HiFi Engine Library has images, specifications and reviews for thousands of audio components. This includes user manuals, original service manuals and circuit diagrams, so when your favorite amp blows up, you can fix it yourself!
https://www.hifiengine.com/

Electron Tubes and Valves : Databases used by Matt's Thermionic Valve/Electron Tube Analyzer (in development)
http://www.dl7avf.info/charts/roehren/index.html
https://frank.pocnet.net/

Reading old floppy discs : Digitize your old floppies now, before they disintegrate or are demagnetized by a magnetic storm!
The Greaseweazle adapter connects a floppy disc drive to your computer via USB. Supports 3.5", 5.25", and 8" with a 50-to-34-pin adapter (e.g. FDADAP). You can read/write floppy disc images in almost any format: PC, Amiga, Amstrad, DOS, CP/M, DEC PDP etc.
https://github.com/keirf/greaseweazle/wiki : Keir Fraser's Greaseweazle wiki, user manual and software tools
https://retroez.com/store/Greaseweazle-V4-USB-Floppy-Adapter-Flux-Reader-Writer-p381405857 : Buy one from the UK, excellent service
 
https://www.retrotechnology.com/herbs_stuff/drive.html : Everything you will ever need to know about floppy disks, by Herb Johnson
https://www.dosbox.com/ : Cross-platform MS-DOS emulator, runs on Windows, Linux, Mac
http://www.freedos.org/ : Free DOS-compatible operating system, boots from CD or USB
https://www.sydneysmith.com/wordpress/run-cpm/ : CP/M 2.2 emulator running on Windows
https://www.sydneysmith.com/wordpress/z80emu/ : Browser-based Z80 emulator, boots CP/M from a disk image
 
https://www.kryoflux.com/ : Another USB floppy adapter, much more expensive than the Greaseweazle but has more sophisticated hardware