CodePen is an online code editor for HTML, CSS, and JavaScript, offering a creative playground for front-end development with features like instant code preview.
CodeAnyWhere is a browser-based code editor with a built-in FTP client, supporting popular web formats and providing features like syntax highlighting and code auto-completion.
ShiftEdit is a web-based IDE that allows development in various programming languages like PHP, Ruby, Python, with support for FTP, SFTP, and Dropbox integration.
JsFiddle serves as an online playground for web developers, offering a space to experiment with HTML, CSS, and JavaScript snippets, and provides features like code sharing and debugging tools.