https://extensions.joomla.org/extension/p8pbb-bridge-light/
p8pbb bridge light, by AlterBrains - Joomla Extension Directory
No hacks to Joomla! or phpBB3 is required. Only four Joomla library files are auto-updated but the changes are safe and does not affect normal Joomla behavior....
joomla extensionbridgelightdirectory