Thank you to Richard Didd for submitting his new software, 'OFFgrid-SDR', a fully offline RTL-SDR receiver program in an installer-free, single index.html file.

The OFFgrid-SDR program runs in any modern WebUSB-compatible browser, can demodulate common modulation types, and includes a spectrum and waterfall display, plus RDS, weather fax, and Morse code decoders. No internet connection is required to run it in the browser.

The program's advantage is that you can put the index.html file on a USB drive and use it portably on almost any machine with a browser. However, Windows users will still need to have installed the WinUSB drivers via Zadig first, and Linux users will need to blacklist the DVB-T drivers from taking over the dongle. macOS and Chromebook should just work without any additional steps.

The code is entirely open source and available on GitHub. More information about the project can be found on the project's GitHub.io page.