https://cloudcannon.com / https://forestry.io/ / https://www.siteleaf.com/
With all of them you can set up nice content type templates and get your client to put structured content.
edit: formatting
However I'm still waiting for the right client project to come along to use it with as it's rare for someone to need a custom-built site and also the fairly limited features of a static cms.
Usually if they want a simple site something like Squarespace will be the quickest and cheapest option, whereas if they have any complex requirements, like migrations or integrations with other platforms, then an open source cms framework like Drupal is often a better starting point.