The following websites have features that can also help support diverse learners with reading and/or writing tasks.
TEXT COMPACTOR
This is a free online tool to automatically summarize text. This is similar to some of the reading comprehension Chrome extensions, but ANY text (including student work) can be pasted into the site for compacting.
This is a great online writing editor that color-codes text for any possible problems it discovers. The site also provides some basic stats for the writing, including grade level readability, and word count.