What is the best static site generator?
 

I decided to make a notion on the best static site generator available in the web.
What providers can you suggest me to try?
Found FLATsite.com but still don't know if you can trust them.
Do you know anything about them?
Alternatives for comparison?

A static site generator is a software application that creates HTML pages from templates or components and a given content source. ... Static site generators are an alternative to database-driven content management systems, such as WordPress and Drupal. In such systems, content is managed and stored in a database.

With the wizard complete, FLATsite.com will get to work taking my standard WordPress site and converting it to a static version made from flat HTML files. They are professional and know what they are talking about.