A quick and dirty web-based tool that allows you to drag a collection of PSX .BIN files into your browser window and in return, have it generate a .CUE file, in case you are missing it.
To find more information and to start generating cue sheets, see index.html in your browser.
The page is hosted at https://nielsbuus.dk/pg/psx_cue_maker/
The excellent PSX emulator DuckStation has adopted the tool and is now hosting it, in an allegedly improved version, at https://www.duckstation.org/cue-maker/