GradeProof - Proofreading with Artificial Intelligence
sup3rS3cretMes5age - A safe, simple tool for one-time (self-destructing) messages
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.
Boop - A scriptable scratchpad for developers. Free & open source!