The plugin Stilus for WordPress enables you to get a check report of your contents in Spanish before publishing them in your WordPress website.

The WordPress E-Prime Grammar Checker improves your writing style by showing hints on to how avoid the passive voice and improve clarity.

This plugin enables Russian, Ukrainian and English spelling for standard TinyMCE editor.

TinyMCE Spellcheck adds the spellcheck button back to the editor in WordPress 3.6 and up.