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A few alternatives.... http://getgrav.org/ http://getcockpit.com/ http://harpjs.com/
Correct me if I'm wrong but they are either hosted CMS solutions (Grav, Cockpit) or static website generators (Harp) like Jekyll and friends.
And yes, Grav and Cockpit are self-hosted flat-file CMS, but now that you ask makes me confused. I was under the impression that Lektor was similar where you have a flat-file CMS and whenever a change is made, the static files are created.
My second guess is that this actually a CMS that exists locally and deploys static files when a change is made?