Since its creation in 2000, phpBB has become the most widely used Open Source forum solution.
https://www.phpbb.com/
Content Management System · Forum Software
Get access to data on 47,085 websites that are phpBB Customers. We know of 5,298 live websites using phpBB and an additional 41,787 sites that used phpBB historically and 1,913 websites in the United States.
Get a list of 47,085 websites using phpBB which includes location information, hosting data, contact details, 5,298 currently live websites and an additional 7,246 domains that redirect to sites in this list. 41,787 sites that used this technology previously and 1,913 websites in the United States currently using phpBB.
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