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, Ona (Previously Gitpod), Github Codespaces and Phoenix Code.
Codiad is a self hosted solution and therefore one of the few free solutions that can be run from the browser just like codeanywhere and does not require installation on every device.