mdbg

Automatically links Chinese characters to the <a href="http://www.mdbg.net/chindict/chindict.php" rel="nofollow ugc">MDBG Chinese-English dictionary</a>, allows conversion of pinyin tone numbers to tone marks and linking pinyin to pronunciation examples.
Please <a href="http://www.mdbg.net/chindict/chindict.php?page=contact" rel="nofollow ugc">contact us</a> if you installed this plugin in your blog so we can add it to the list on the <a href="http://www.mdbg.net/chindict/chindict.php?page=wordpress" rel="nofollow ugc">MDBG website</a>.

MDBG Chinese-English dictionary

Links Chinese characters to the MDBG Chinese dictionary, allows conversion of pinyin tone numbers to tone marks and pinyin to pronunciation examples.

Sparanoid

A must-have plugin if you’re running a Chinese blog. This plugin also works fine with multisite enabled WordPress (aka. WordPress Mu).
No options, no additional database inserts, no stupid banners and shitty ads, install and go.
你客戶／合作夥伴不光文案寫的爛，而且還不會排版？Space Lover 可以幫到你。它會神奇的在中文、日文和英文、數字、符號之間自動加入空白，讓客戶網站的文案、文章看上去規範整潔。
無選項、無 MySQL 插入，無廣告，安裝即用。
覺得這招治標不治本？也可以試試 <a href="https://github.com/sparanoid/chinese-copywriting-guidelines" rel="nofollow ugc">sparanoid/chinese-copywriting-guidelines</a>，讓你的客戶／合作夥伴學會如何正確的排版。
Before:
<pre><code>今天出去買菜花了5000元
</code></pre>
After:
<pre><code>今天出去買菜花了 5000 元
</code></pre>

Space Lover

Magically add an extra space between Chinese characters and English letters / numbers / common punctuation marks

MDBG Chinese-English dictionary vs Space Lover