Extension I'm Currently Using - Wordtune
I featured Wordtune in a video and blog post a couple of months ago. The short summary of it is that when you have Wordtune installed you can simply highlight a sentence in Google Docs, Gmail, or Outlook and it will suggest changes to your sentences. The suggestions will include corrections to grammar and spelling. Wordtune's suggestions also include changes to your phrasing and word choices. Here's my short video overview of Wordtune.
Other Tools to Try
Hemingway App provides students with lots of helpful information about their text. To use the service students just paste some text into the Hemingway editor and it will provide you with a bunch of information about that text. Hemingway highlights the parts of your writing that use passive voice, adverbs, and overly complex sentences. All of those factors are accounted for in generating a general readability score for your passage. Here’s a little video overview of Hemingway App.
Slick Write is a service that students can use to help them analyze their own writing and or that of other writers. Slick Write identifies typical things like word counts, readability, and an estimated reading time for a document. Slick Write will also analyze use of adverbs and prepositional phrases throughout a document. Users can pick and choose what they want Slick Write to identify in a passage.