This may count as spam, but since I've been playing here for over 10 years, I feel entitled :-)

There's a new SGF editor for Android on the Play Store: Black & White Go. Works on phones and tablets. Try the free version and tell me what you think!
(searching for my last name, Oldenhof, works best to find it)

Does it edit Toroidal Go games correctly and accurately?

No, sorry

Thanks I've picked it up. I really like it's light an effective interface.

Now I just need to find some more good practice problem sets for GoGrinder and how to translate littlegolem positions to sgfs that I can analyse offline…

jugular, You can down-load the SGF files, just click on the TXT box (SGF files are a special type of TXT file) of which-ever game you which to analyse off-line.

I meant: You can down-load the SGF files from LittleGolem, just click on the TXT box (SGF files are a special type of TXT file) of which-ever game you wish to analyse off-line.