OctoEdit is a Chrome add-on developed by Andrew Levine that enhances the comment editing experience on GitHub.com. This free tool adds a new tab to the comment edit area, providing Markdown syntax highlighting and tabbing behavior.

With OctoEdit, users can now easily write and edit their comments on GitHub with the added convenience of syntax highlighting. This feature helps in making the comments more readable and organized, especially for those who frequently use Markdown formatting.

Additionally, OctoEdit also introduces tabbing behavior to the comment edit area, making it easier to navigate and structure text. This can greatly improve the overall editing experience, allowing users to quickly indent or format their comments.

Overall, OctoEdit is a useful Chrome add-on for GitHub users who want to enhance their comment editing experience. With its syntax highlighting and tabbing features, it provides a convenient way to write and edit comments on GitHub.com.