"SpawnCharacterP6 update" is a free Python script by svdl that can create INJ and REM poses. It only works for figures that contain PBMCC channels, but that includes most DAZ figures, Antonia, and a few others. An alternative that will create INJ and REM poses for any figure is "Pozers Little Helper" (PLH), this is a free stand-alone application (PC only). It needs a bit of initial setting up, and has a bit of q learning curve, but works very well once you get the hang of it.