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.
Links to puzzle sites all around the web
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