PuzzleBomb

[dickoon]

A PDF page of original puzzles every month is published at http://aperiodical.com/category/puzzlebomb/ .

Caution: not all the puzzles meet the statuory definition of "culture-fair language-neutral puzzles", but enough of them do (for instance, the Waterfall) that this is definitely very likely to be of interest to reader here; even the not-quite-so-confined ones often bear clear hallmarks of influence from familiar puzzle types. The quality and originality look spot on to me, too.