[LightningGSX]

You want UberData or Crome, which are rom editors.You can use also EcuControl which, I believe, is realtime like DSMLink, but I don't know much about it.I'll check into it for you

http://uberdata.pgmfi.org/
http://www.pgmfi.org/twiki/bin/view/Library/WebHome

EDIT: Here's the link for Crome http://www.radicalperformance.com/download/