Difference between version 3.0 and one 3.1
https://www.phpbb.com/about/launch/
download - https://www.phpbb.com/downloads/
phpBB-ext-sitemaker
Allows you to transform your phpBB3 board into a full-blown site.
https://www.phpbb.com/community/viewtopic.php?f=456&t=2362521
https://github.com/blitze/phpBB-ext-sitemaker
official release (module download) ready for use - http://phpbb-sitemaker.website/
similar :
https://www.phpbb.com/community/viewtopic.php?f=72&t=2060975#p12552775