I never heard of it. It does look like an interesting solution for clients who just want a simple site.
It is a paid solutions, although not very expensive.
There is an administration area. There is no database, but it is not a static site. Perhaps it is built and updated with text files.
Support - Pulse CMS
I'm not sure that it would save any time versus doing a simple static site.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin