Christiaan Conover

Author Customization gives you much more flexibility in managing post and page author data. Your author data will no longer be tied solely to the WordPress user system, and can now be managed on a per-post basis. Author name and description are saved with each post, allowing you to preserve this information as it was when the post was published.
Features
<ul>
<li>Per-post author display name and biographical info</li>
<li>TinyMCE (WYSIWYG) editor for user profile and per-post biographical info</li>
<li>rel=”nofollow” link inside biographical info entries</li>
</ul>

Author Customization

Author Customization expands core author management with features such as per-post author information and rich user bio editing.

Dmitry Ponomarev

Модифицирует в визуальном редакторе TinyMCE стандартную проверку правописания на проверку правописания используя сервис <a href="http://api.yandex.ru/speller/doc/dg/concepts/speller-overview.xml" rel="nofollow ugc">Яндекс.Спеллер</a>, что очень подходит для проверки текстов на русском языке.

Yandex Speller Application

Проверка правописания в TinyMCE, используя Яндекс.Спеллер.

Author Customization vs Yandex Speller Application