Codeanywhere is described as 'Code editor in a browser with a powerful ftp client integrated, and all popular web formats are supported (HTML, PHP, JavaScript, CSS, and XML)' and is a popular IDE in the development category. There are more than 25 alternatives to Codeanywhere, not only websites but also apps for a variety of platforms, including Mac, Linux, Windows and Self-Hosted apps. The best Codeanywhere alternative is IntelliJ IDEA, which is both free and Open Source. Other great sites and apps similar to Codeanywhere are AWS Cloud9, Phoenix Code, Ona (Previously Gitpod) and Github Codespaces.
An actively maintained fork of Codiad, which was (one of ?) the best opensource online IDE