PBR.ONE is a toolkit for creating interactive web-based previews of PBR materials and HDR panoramas. It was originally built for ambientCG.com but is now fully Open Source. You can use it to show off materials and HDRI environments right in the browser, for example as part of an asset store or on a portfolio website.
This documentation covers the installation, how to import your media and how to adjust the preview parameters. Check the individual tabs at the top to pick a topic or just follow the link at the bottom.