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.

priberam

IMPORTANT: The free version of the plugin only checks the spelling of the texts in the pre 1990 Spelling Reform and doesn’t present any suggestions for the errors. This means that no grammar and style checking is done and only texts following the pre 1990 Spelling Reform can be used. 
To unleash all the features of the plugin you should get a key to have access to Priberam’s proofing API.
Not compatible with Gutenberg.

FLiP – Portuguese Proofing Tools

IMPORTANT: The free version of the plugin only checks the spelling of the texts in the pre 1990 Spelling Reform and doesn’t present any suggestions fo …

Yandex Speller Application vs FLiP – Portuguese Proofing Tools