The Real Spellers website is permanently offline.
If you are interested in SWI (Scientific Word Investigation, or Structured Word Inquiry, depending on who you talk to), in addition to several FaceBook groups, you will find the following sites and books useful:
ToolBox 2 - the ultimate compendium of SWI knowledge (1 free theme, the rest by subscription)
Orthographica - videos made to accompany Spellinars (by subscription)
WordWorks Kingston - the website of Dr. Pete Bowers, the worldwide guru for using SWI in the classroom.