Sergey Biryukov

Allows to create users with usernames containing Cyrillic characters.

Allow Cyrillic Usernames

Allows users to register with Cyrillic usernames.

Andrey Ovcharov

Plugin sanitizes title for post slug, replacing non-Latin characters to ASCII.
Requires <a href="http://derickrethans.nl/projects.html#translit" rel="nofollow ugc"><code>PECL::Package::translit</code></a>
At the moment the supported transliteration filters include: * Cyrillic-to-Latin transliteration; * Greek-to-Latin transliteration; * Han-to-Latin transliteration; * Hebrew-to-Latin transliteration; * and filters to remove diacriticals from text.

WP Nice Slug

Converts non-Latin characters to ASCII in post slugs.

Allow Cyrillic Usernames vs WP Nice Slug