Others' work

Four-Dimensional Visual Exploration of the Complex Number Plane - ICGG 2022 conference

As mentioned under WhoSupports, the video of Mgr. Michal Zamboj and Jakub Rada, where it displays a 4D space representation of the function w=1/z: see at 5:54.

Complex functions graph, by kojocho2.

Though regrettably of poor resolution, these graphs are some of the oldest sources I found, and correspond almost entirely to the 4D graphs of my own making.

Full 4D View of Complex Functions, in Reddit/Desmos.

A 4D-to-2D projection proposed by this user. It inspired me to look for initial axis units' projections spanning a tetrahedron.

A 4D complex functions plotter, in Reddit/Desmos.

Another 4D-to-2D projection proposed by this user. 

4D Coordinate Axes and Stereographic Projections, in Reddit/Desmos.

A 4D-to-2D projection proposed by a [deleted] user. Nice projections, see this Desmos file, but he didn't think of applying his method for rendering complex functions... 

... so I modified it in a Complex Function 4D grapher ;-)

See my classical example w=1/z with this adapted Desmos file. 

4D Clifford Torus Hypersurface, by Abderrahman Taha.

4D-to-3D projection of a rotating Clifford torus.

Grapher - 4D Sine Wave Rotations, by Tony Burk.

4D-to-3D projection of a rotating Sine.

L'hypersphère : la sphère en quatre dimensions, by Les idées froides (Alain Bernard).

4D-to-3D projection of a 3-sphere.

Wikipedia Talk:3-sphere.

Nice 4D gifs of Clifford tori (see projections 1-2-3) rotating, or filling up the 3-sphere. Strikingly similar to mine.

Pacific Tech's° Visualizing Functions of a Complex Variable.

Webpage with image links to (free) graphing calculator's gcf files. See 4D files under "Using 4D perspective projection". Also available at "24 Views of the Complex Exponential Function".

° Its Graphing Calculator (Windows version) is the only app I know of that comes yet with 4D graphing on board! Alas, it seems that the Windows version is no longer on offer.