DZVO

Delete automatic all old revision from public posts. Than post older x days.

revision delete!

Scribit

Proofreading plugin allows you to improve the quality of your posts, pages and all your WordPress website. 
It gives you the possibility to check the correction of the texts inserted into posts, pages and drafts in less than a second!
Press the “Analyze” button and you will have a list of all found errors. 
The plugin allows to recognize different types of text errors (thanks to Languagetool.org). Here some examples of error types: 
* Typos 
* Punctuation 
* Typography 
* Commonly Confused Words 
* Nonstandard phrases 
* Semantic 
* Grammar 
* Redundant Phrases
Proofreading plugin supports a lot of languages. For example: 
* English 
* Spanish 
* German 
* Italian 
* Japanese 
* French 
* Portuguese 
* Russian 
* and so on…
For every language, in the settings page, you can customize which are the error categories you are interesting, hiding the others.

Proofreading

I think it is very useful inside Wordpress world. All site must have it to avoid common text errors.
It does not take up much space in the backend Wordpress console so it can always be left activated.

P.S: I'm the autor of the plugin.

Very useful

Proofreading checks texts on every content of your WordPress site. You can proofread in 30 different languages and get tips to improve your writings.

revision delete! vs Proofreading