DeltaWalker runs on the word's three most popular operating systems:
DeltaWalker 1.9.9 onward requires Java Runtime Environment (JRE) 1.6 or newer.
Both the 32 and the 64-bit versions of the above operating systems are supported. A 32-bit OS requires the 32-bit JRE and a 64-bit OS requires the 64-bit JRE. On the Mac Java comes pre-installed (Lion and Mountain Lion downloading and installing Java involves an extra step).
DeltaWalker will likely run fine on other versions of the supported operating systems environments beyond the reference platforms we regularly test on. That applies in particular to the various Linux distros - as long as GTK+ 2.2.1 or newer and JRE 1.6 or newer are present, DeltaWalker should run fine.