This extension, created for phpBB 3.1+, enables the easy addition, removal and editing of three possible ad slots: one in the header, one in the footer and one after the first post of every topic page.
It was created to aid clients who have moved from a managed phpBB instance to their own, unmanaged installation of phpBB. These clients often struggle with making changes to themes themselves (as previously this was handled for them) and so this offers as a nice buffer between the two scenarios. This extension is used extensively by a number of customer with much success.
More information: Envesko Services