With QOpenAip2Kml, you can convert an openaip.net file to a KML file compatible with all software which support KML format. For example, you can use the outputed KML file in Google Earth, or on your website.
Here is an example of a map with all french airspaces, displayed on WordPress with WP OpenStreetMap Plugin. The KML file is produced by QOpenAip2Kml.