It compares Cordial, Antidote, Pro Lexis and Word which are apparently all software which correct grammar and spelling. I haven't heard of any of them except Word, must be some French thing. But there is even a mistake in the last column (Word one) that the writers of the article did not pick up and highlight ;)
... just goes to show you that noone's perfect! :P
Also goes to show you that my French must not be good enough as I don't know what "entraider mutuellement" even means. I find the spelling mistakes very easy to pick up, the grammar less so.
(Image from ladictee.fr Facebook page)