This TextMate2 bundle contains the ApLo application which manages HTML output windows for other bundles.
Open a terminal window and enter these commands:
cd ~/Library/Application\ Support/Avian/Bundles
git clone --recursive git://github.com/gknops/aplo.tmbundle.git
Important: After installation, in TextMate2 go to Bundles/ApLo/Launch ApLo to make sure the system registers the application.
The ApLo source code is available on github, click here.