http://jcbonsai.free.fr/sudoku/?page_id=216
The program has a few drawbacks such as always trying to group 6's together and insisting on some bit of symmetry whereas I prefer a scattered numbers placement, but I run the generator over and over while watching TV to get the puzzles I might want to use.
So that I can avoid being hacked I have no normal Java installed but instead use PortableApps.com Platform to launch the Java Portable Launcher to launch jPortable and run JSudoku.
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JSudoku -- settings used
font --> Arial Narrow size 24
jigsaw template symmetries = all
color -->
windoku 89 107 126
windoku background 90 120 200 a=32 width 3
jigsaw 77 77 77 width 7
nonet 77 77 77 width 4
diagonal 0 0 0 a=32 width 3
consecutive 88 88 88 width 7
extra group color 1 = 255 255 255
color 2 = 237 252 217
color 3 = 252 237 217
overlaped grids background 200 110 80 a=32
puzzles pixels -->
large 650
medium 400
regular 300
Basic = Rating: Super Easy
Easy = Rating: Very Easy
Moderate = Rating: Easy
Watch the Log panel to be certain the
rating is what you want and that
the number of bottleneck singles is low,
between 1 to 8 depending on the type
of puzzle being generated, and that the
numbers of givens is OK.
Watch that the puzzle does not have too
much of certain numbers in one part of
the puzzle such as a majority of 7's in
one part of a Samurai puzzle.