GradeProof - Proofreading with Artificial Intelligence
Cryptgeon - Securely share self-destructing notes
Proofree - Free proof-reading by humans.
BURN.link - Send secure, encrypted, self-destructing messages
Analyze My Writing - Analyze My Writing is an online text content and readability analyzer.
Burner Note - Burner Note is a free, ad-free and open sourced service for sending secure text based notes that are completely erased from existence once they've been read.