SAUCE has proven quite resilient and adaptable. I don't think it really works for describing newer developments like like Utf-8, 256 color or RGB ANSI art. It maybe misses some vintage platforms like ATASCII. But that could change with a format update. For MS-DOS and Amiga ANSI art packs, and some nicher formats like Xbin, it's pretty standard.
XBIN files have been scattered around artscene packs since the 90s, but since it is directly tied to VGA hardware, it remains niche. Some people really like it. I have always found it tricky to work with.
I like to think the DUR (durdraw) format can be adopted or extended to describe most text art, though custom font support like Xbin is not in the current version. I also like to think that DUR's JSON core makes it easier for mortals and programmers to play with than SAUCE's dense binary format (and ANSI escape codes, even), but that's a bit subjective.
Durdraw is a modern and powerful ANSI editor for Linux/Unix/MacOS/WSL. Unlike other ANSI editors, it supports Unicode/Utf-8 encoding and 256 colors. Frame-based animation with custom speed control, too.
Durdraw actually can open the files directly from 16colo.rs (File Open screen, tab to or click on "16colo.rs archive"). You don't need to download them first.
It also includes a program called "durview" for just viewing instead of editing the files. It works quite nicely for browsing the live 16colo.rs archive.
Since Durdraw and Durview automatically convert from CP437 to Utf-8, you don't need a custom font. It's very nice.
For leaving on the screen, you can load the ANSI file in Durdraw, then save it as a Utf-8 ANSI. That converts the character encoding to be Linux compatible. Then you can just "cat" the file from the console.
I am not a ghostty user, but I think it has a setting for that, if you can figure out which font iTerm2 is rendering those glyphs with.