Markdown Editor is a Chrome add-on developed by chenzhiwei. As the name suggests, it is a Github Flavored Markdown Editor that allows users to write and edit markdown files. The program offers several useful features that make it a handy tool for developers and writers.

One of the key features of Markdown Editor is its ability to save data in real-time. This ensures that users don't lose their work even if they accidentally close the editor or experience a system crash. Additionally, the program allows users to open local markdown files, making it convenient for accessing and editing existing documents.

Another useful feature of Markdown Editor is the option to save content as a markdown file. This makes it easy to share or transfer files between different platforms or applications. Additionally, the program offers the ability to print to PDF using Chrome's native printer, allowing users to create PDF versions of their markdown documents.

Markdown Editor also supports Github Flavored Markdown syntax, making it familiar and easy to use for those already familiar with the Github editor and preview format. This ensures that users can seamlessly transition between platforms without any compatibility issues.

Overall, Markdown Editor is a reliable and user-friendly tool for editing and creating markdown files. Its real-time saving, file opening, and exporting features, along with Github Flavored Markdown support, make it a valuable addition to any developer or writer's toolkit.