PythonAnywhere is a fully-featured Python programming environment that runs in a web browser, including free web app hosting.
not an app, only a link to a subscription
It's really the only thing you way to use VIM on your Chromebook.
great browser programming. not much else to say.
https://gofullpage.com
http://colorzilla.com/
https://callumlocke.com
Chrome Enterprise Team
https://developers.google.com/web/
https://www.seoquake.com/
https://clearcache.io
http://www.seo-extension.com/
https://modheader.com
https://postman.com
stylus.openstyles
http://seleniumhq.org/