Most of the puzzles at this site by Seth Weiss, member of the mathematical faculty of Lincoln Sudbury Regional High School of Massachusetts, seem on-topic for people here. Some of the applets are better-suited to their puzzles than those at janko.at, some slightly less well-suited. Inevitably, many of the puzzle names are different to those used around the world. Particular points for featuring the English-language rules to "Stars and Arrows", also known as Sternenhimmel, also known as today's croco-puzzle rated puzzle.
If you see this, Seth; thank you, lovely work!
Links to puzzle sites all around the web
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