The Ultimate Blog Extension
Clone into phpBB/ext/posey/ultimateblog:
git clone https://github.com/MrGoldy/ultimateblog.git phpBB/ext/posey/ultimateblog
Or download the zip and upload contents to phpBB/ext/posey/ultimateblog/
Go to "ACP" > "Customise" > "Extensions" and enable the "Ultimate Blog" extension.