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First, look at the recognised chess variants here:

http://www.chessvariants.org/rindex.html

Then, all national chess variants with a player community and some
tradition; i.e., Makruk, Sittuyin, Shatar (Mongolian Chess).

You may also look at contest-winning chess variants and contest finalists,
see here:
http://www.chessvariants.org/index/mainquery.php?type=Contest&orderby=LinkText&displayauthor=1&displayinventor=1&usethisheading=Contests