GradeProof - Proofreading with Artificial Intelligence
Writefull - Writefull provides you with the tools you need to improve the quality and consistency of your writing.
Nurtz - Proofreading concierge in your Slack
Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.
Proofree - Free proof-reading by humans.
Just Not Sorry - Highlight 'weak' words so you can edit them out