Flextatic is in active development, but is not yet complete. Here's what it can do, currently. To see all the planned features, visit the roadmap page.
You can manage all your websites from a single control panel.
Isn't that great? From a fully graphical and user-friendly interface, you can create static sites that are incredibly fast, stable, and secure.
Manage content types and associate them to your different websites. You won't have to create the usual content types for each site individually.
Thanks to the template system used by flextatic, you can give to your websites the look&feel you want, separating the design from the content
Manage taxonomies flexibly and associate them to your websites.
Publish your sites automatically using git
Create content associated with content types and taxonomies quickly and seamlessly
Each time you click the "publish" button, flextatic saves a new version of the website that can be retrieved later. More security again.