1. Grammarly: Grammarly is a popular writing tool that helps improve grammar, spelling, punctuation, and style. It offers a free version with basic features and a premium version with advanced functionalities.

2. Hemingway Editor: Hemingway Editor is a web-based tool that analyzes your writing and highlights complex sentences, passive voice, and common errors. It provides suggestions to make your writing clearer and more concise. The basic version is free to use.

3. LanguageTool: LanguageTool is an open-source grammar and style checker that supports multiple languages. It can detect errors in grammar, punctuation, style, and more. It offers a free version with limited features and a premium version with additional functionalities.

4. ProWritingAid: ProWritingAid is a comprehensive writing tool that checks grammar, style, readability, and more. It provides detailed reports and suggestions to improve your writing. It offers a free version with limited features and a premium version with advanced functionalities.

5. Ginger: Ginger is a writing assistant that helps improve grammar, spelling, and punctuation. It offers features like sentence rephrasing, translation, and text-to-speech. It has a free version with basic functionalities and a premium version with additional features.

These tools can be used as alternatives to Quill Bot and offer various features to enhance your writing.