Middleman Blog Editor is a paid extension to Middleman which adds WYSIWYG article editing and a blog organization interface.
This extension makes it possible to host a Middleman Blog and give the editor URL to a client so they can add content. Files are modified in-place, so committing those changes to source control or deploying new builds is up to you.
The current release, v0.4.1, costs $12 and can be purchased online. Purchasing will give access to private Rubygems server (http://gems.tdreyno.com), direct gem file download and full source file download.
Use the public Github issue tracker: https://github.com/tdreyno/middleman-blog-editor-issues/issues
The official website of this project is: http://middleman-blog-editor.awardwinningfjords.com
Documentation will be evolving as the project does on that site.
There will be 5 feature releases. Pricing will be a simple multiple of the price ($30), by the current version. Free updates for the entire 1.0.x line, after initial purchase.