This tool dnstwister.report is interesting it can also find the Punycode domains which are available and not yet registered to any domain provider.
I don't think if it is good to put this tool here because they can use that tool to make a fake/phishing website(it means it also helps scammers to find Punycode domain)
Take a look at this one as a sample that I found from that tool
https://xn--bitcointal-2wb.org
If you enter that domain to chrome and firefox browser the result will be bitcointalķ.org no difference to the original website (orig:bitcointalk.org) the only thing you will notice is the letter k if you check the URL carefully. And the Punycode domain is very cheap to register to any domain provider.
I don't think if it's fine to post this tool here what do you think?