specifically, Codemirror got funding [0] via the Prototype Fund [1], which is a partnership beteeen the Open Knowledge Foundation Germany [2] and the German federal ministry of education and research [3].

they fund public-interest open source projects, several per funding round.

[0] https://prototypefund.de/en/project/codemirror/

[1] https://prototypefund.de/en/about-2/

[2] https://okfn.de/en/

[3] https://www.bmbf.de/en/index.html