Free download of Inferno and a browser plug-in is available: From this Vita Nuova page you can download a free version of Inferno or order one of the commercial distributions. A plug-in version for Web browsers is also available.
LinuxDevices.com: Lucent spinoff Vita Nuova releases Inferno OS source: Inferno source code made available under a liberal, low cost subscription plan.
Vita Nuova Holdings Ltd.: Inferno: The OS for distributed applications on network devices. Lead distributor for Inferno and Plan 9 OSs.