PSD Layer Viewer
PSD Layer Viewer is an extension for the code editor Brackets that allows to view PSD files, export layers, generate CSS code.
It is a very simple extension that shows panel with site http://psd.keyangxiang.com/ which is an awesome tool to work with PSD files.
The extension have one little issue: "Export PNG" button doesn't work, so you should use drag and drop for saving image above the button.
Installation
PSD Layer Viewer is installed from the Brackets Extension Manager.
Acknowledgements
Author of Online PSD Viewer: Keyang Xiang