Tome Drupal Module for Static Sites
Tome is a Drupal module which allows an entire Drupal site to be exported to a static HTML copy.
Because the static HTML version of the site doesn't run on PHP and only needs an HTTP server, this is potentially a useful way to lower hosting costs, increase security, and improve performance on sites which are very rarely updated or are archived.
Learn more about Tome
Updates
Assess
For sites which use forms, we've done some preliminary development work on a contrib module to support these: Tome Forms.