.fay

Encode emails to avoid spams. Template to use [@encode@ email=”ilove@gmail.com” display=”Gmail Lover”]
The encoded result (kind of <a href=”mailto:&#105&#108ў&#046com”>Gmail Lover</a>) is made undetectable by bad bots but still readable for browsers
See screenshots for more details.

WP Emails Encoder

Encode emails to avoid spams. Template to use [@encode@ email="ilove@gmail.com" display="Gmail Lover"]

crille

Non-ASCII characters can be used in the URL, but they have to be encoded (RFC3986). URL encoding is widely used (e.g. Wikipedia http://ja.wikipedia.org/wiki/Wikipedia:%E9%80%A3%E7%B5%A1%E5%85%88). 
This plugin encodes NON-ASCII characters in the slugs of your pretty permalinks. So your slugs may look like <code>fußball-in-nürnberg</code> or <code>連絡先</code>.

Permalink Encoding

This plugin encodes NON-ASCII characters in pretty permalinks by using Percent-Encoding described in RFC3986.

WP Emails Encoder vs Permalink Encoding