That's an open G Tuning you're using, DF.

There's Open D: DADF#AD

And DADGAD (which is actually an open Dsus4 tuning) a nice modal one used a lot for Celtic music

There's a nice crosstuning I use a lot: An open Em tuning EBEGBE (which I call EebieJeebie tuning) but it requires tuning two strings up a full tone, usually considered a no-no, but I do it anyway (but I don't leave the guitar that way for long. It's good for bluesy stuff.

And EADEAE, sort of the DADGAD equivalent for the key of A. Again, modal and good for Celtic. I do Mingulay Boat Song in that tuning. Nice bagpipey flavour.