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I would be interested in a list of (used/popular?) applications that are written in Scheme.

I get the impression that a lot of Scheme code is in projects that never get published. I can easily name 5+ Scheme implementations that I heard of, but I don't know any prominent examples of software implemented in Scheme.

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TeXmacs is an impressive project spanning several decades:

https://www.texmacs.org

It uses Guile as its scripting language and documents created within TeXmacs are represented as Scheme programs.

In addition to providing a LaTeX-quality WYSIWYG editor experience for scientific documents, TeXmacs can also be used as a computer algebra front-end for packages like Mathics, which provides an open-source implementation of the Wolfram programming language used in Mathematica:

https://mathics.org/

The Shepard init system[0] for Guix and most of the Guix plumbing are written in Guile Scheme. There's also Guile Emacs.

[0]https://www.gnu.org/software/shepherd/

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