Mecha is a file-based CMS that is focused on the principle that a static website must be personal, portable, light and easy to be exported and backed up. Mecha has a fairly flexible API that keeps you happy and focused on developing your own website.
Lacks available extensions or plugins, and extending functionality requires custom programming.
Management of content and data is relatively straight forward, but there may be a bit of a learning curve. Some programming experience may be required.
Lacks an active community, and there is no or minimal support provided. Lacks proper documentation.