I find it kind of cute that they set up this mock-up currency 'kudos' to toy around with it. (https://demo.taler.net/en/)
What makes it (more) cute is that you can use it to reserve entries in their GNS first-come-first-served service. (https://fcfs.gnunet.org/)
GNS being the GNU Name System which is a decentralized/p2p equivalent to DNS. (https://www.gnunet.org/en/gns.html)