Ask HN: Static site with browser CMS?

I'm wondering if a tool along these lines exists, I can't really find a way to google it successfully. I'm looking for a platform where the site is FULLY static on the server, but includes a Javascript client CMS or something similar that authenticates to FTP on the server and edits files. In this way the site could be hosted on Neocities, cheap static hosting, etc... without needing to be managed from a desktop app or command line. Similar to Webhook but without the external build and database.

I'm considering building something along these lines but I'm wondering if it already exists.