Vilfredo goes to Athens, or just Vilfredo, is an eDemocracy project that tries to use mathematics to help people reach consensus on an open question. The demo website is available at demo.vilfredo.org
The source code is available at: https://github.com/fairdemocracy/vilfredo-core (for the server-side API core) and https://github.com/fairdemocracy/vilfredo-client (for a web client that uses core API).
You can get a free API key and develop a new client if you don’t like ours, or you can download the vilfredo-client and get a free API key to use Vilfredo as your private client instance, or download both and build your own infrastructure. Also we plan to re-launch www.vilfredo.org with the new version.