There are two types of porters exporters and importers.
An exporter is an application that can export a 3D scene in a format that Babylon.js can recognise. These include designers such as Blender, Unity and 3DSMax.
An importer is any method used by Babylon.js to load a file into a scene.
The Babylon Editor is a web application specifically designed for supporting Babylon.js. It can import and export .babylon . It goeas above and beyond the usual exporters and allows you to put the finishing touches to your scene through a user interface.
The Editor is available at http://editor.babylonjs.com/ and includes features such as creating and editing particle systems and animation; saving projects on OneDrive; cinematic editor and scene graph view.