YukiWiki is a Japanese wiki engine, hosted at hyuki.com. It is available in three versions: YukiWiki2, YukiWiki1 and YukiWikiMini. The essence of programming. Development of the software was put on hold from March 2011, but the software, written in Perl and using CGI scripting, is still available for free download, with the latest version of YukiWiki2 here.
The actual syntax of the wiki engine is unknown, but its homepage includes many links to other Japanese wiki articles and books.