Works with Columns UI and Default UI.

Spetralissime is a standalone Spectrum Analyzer application based on high precision band pass filter bank, more adapted to the human audition. Spectralissime gives a more consistent spectrum analysis and allows better understanding of any audio phenomena thanks to its constant precision, from 20 Hz to 20 kHz.

www.vb-audio.com/Spectralissime
voicemeeter.com/vb-audio-spectralissime-professional-high-definition-multiband-audio-analyzer
Discogs Enhancer is a free, open source extension that adds extra features to both Discogs.com and Chrome.
You can block sellers, use a dark theme, see price comparisons, get feedback notifications, convert foreign currencies, search Discogs and other online record shops with any highlighted text, improve tracklist readability, customize lots of Marketplace aspects, and more!
Every feature is optional so you can choose only the features you want to use.
Soundgrain is a graphical interface where users can draw and edit trajectories to control granular sound synthesis. Soundgrain is written with Python/WxPython and uses Pyo as its audio engine.

The Album Art Downloader is a program designed to make life easier for anyone who wishes to find and update their album art for their music collection. The sources for the pictures can be defined by creating plugin scripts.

sourceforge.net/projects/album-art
sourceforge.net/p/album-art/discussion
HydrogenAudio Topic
WaveSurfer is an open source tool for sound visualization and manipulation. Typical applications are speech / sound analysis and sound annotation / transcription. WaveSurfer may be extended by plug-ins as well as embedded in other applications.
Features:
- Customizable – users can create their own configurations. Localization support.
- Extensible – new functionality can be added through a plugin architecture.
- Embeddable – WaveSurfer can be used as a widget in custom applications.
- Transcription file formats – reads, and writes HTK (and MLF), TIMIT, ESPS/Waves+, and Phondat. Support for encodings and Unicode.
- Multi-platform – Linux, OSX & Windows.

sourceforge.net/projects/wavesurfer
en.wikipedia.org/wiki/WaveSurfer
There is an updated version here.
Adding scripts is one method used to extend Foobar’s abilities. Not only are there quite a few existing useful scripts, new custom scripts can be written. One great script is the Biography script which displays biography and rating information from both AllMusic and Last.FM
Script Panel:Youlean Loudness Meter is your ultimate free VST, VST3, AU and AAX plugin for loudness measurement.

Implementation of a K-System meter according to Bob Katz’ specifications.
K-Meter supports mono, stereo and 5.1 surround sound signals. All meters have been thoroughly validated. The average meter reads either RMS levels or ITU BS.1770-1 loudness weighted levels.
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Raven Lite is a free cross-platform software program that lets users record, save and visualize sounds as spectrograms and waveforms. Raven Lite is intended for students, educators, and hobbyists and can be used for learning about sounds, as an aid in birdsong recognition, and in musical instruction.
- Lyrics plugin software for iTunes, Windows Media Player, Winamp, etc. You needn’t change your way of enjoying music.
- Display scrolling lyrics, you can follow along with the artist and catch every word.
- Automatically search and download lyrics.
- Huge lyrics database, and it is expanding every day.
- Download and save lyrics in your song files, you can view these lyrics on your iPod or iPhone.
- Amazing translucency skins.
- Cross-platform, support Windows, Mac and Android.
