Do any of you know of any publicly available software (free, shareware, or low-cost) that can make gattai (multi-grid) puzzles? I know that Ruud wrote one that he used for the gattai he published, but IIRC, he never intended to make his gattai-maker available. Børge also had one that he was working on, but as far as I know, he never completed it. Jean-Christophe's JSudoku can make a few types, but none of the newer varieties (not even Ruud's taiken, MOAG, or DOAG, which he introduced in 2007). Sadly, all three men are gone from the Sudoku scene (although I think I can still contact Børge via email).
I know there are web sites out there that have small collections of gattai, but once those are done. . .