Sitewriter is a simple, configurable service for adding Micropub to static web sites.
It is an open source Sinatra application (MIT license), feel free to fork.
A public instance is hosted at https://sitewriter.net/.
It is still very rough and requires some geek knowledge (i.e. bring your own GitHub authorization token). If you're auto-building a static site from a repository on GitHub, you can probably figure it out.
As of May 2019 it is used by four personal domains, three built with Eleventy and one with Jekyll.