FixThisEmail.com is a powerful and free AI assistant that acts as a simple email bot. Send any email text to Help@FixThisEmail.com and the bot will respond with a suggested revision of your email in the style you specified in the subject line.

RecomBuilder.com is a free tool that uses the GPT-3 AI to help write the first draft of a recommendation letter or reference letter for any purpose. It provides useful prompts that get the AI to generate a well-structured letter that covers key points.