Hi,
We have now a "Powered by syslog-ng" page on our website. It's available at
https://syslog-ng.org/powered-by-syslog-ng/If your project / company / product / etc. uses syslog-ng, we are happy to include you on the list too, just e-mail me directly!
Some of the more interesting names from the list are Facebook, Kindle, FreeNAS and of course all the major Linux distributions.