Low tuning on ukulele?

Hi everyone, I know there are some ways to tune the ukulele (high or low). I know a few of them but can you tell me all the low tunings? (on a Kala, concert uke)

The most common lower tuning would be to replace the G string with a G string an octave lower.

Another lower tuning would be open C, or tuning your A string down to a G.

Or you could just lower all the strings down a half step or a whole step until they get to floppy to play.

gp-ak said:

Or you could just lower all the strings down a half step or a whole step until they get to floppy to play.

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Would that be "slack" ukulele?