I have a soprano tuned aDF#B, useful instead of a capo as a capo, especially on a soprano uke, gets in the way. I also keep a concert uke tuned fBbDG, a tone down from standard.

aDF#B was once considered the standard for soprano ukes. I have a George Formby songbook and it specifies different tunings for different songs. As well as gCEA and aDF#B, it also specifies BbEbGC, a semitone higher than aDF#B.