I've encountered SAUCE, long since; but the page is right. I've personally never directly encountered XBIN, and it does seem that it did not take off as predicted.
* https://acid.org/images/0896/XBIN.TXT
The world does not seem to have managed to do for text (art image) files what TIFF did for graphics files. Although https://16colo.rs/ , recently on Hacker News (https://news.ycombinator.com/item?id=44665816) seems to be getting by on just SAUCE plus FILE_ID.DIZ.
See https://github.com/ansilove/ansilove#features , for one example of what we have instead. (-:
I would have quipped that someone has yet to have the idea of using JSON instead of these directly-machine-readable binary formats. But the DurDraw developers have indeed done that very thing.
* https://github.com/cmang/durdraw/blob/master/durformat.md