See these previous questions:
Besides the links mentioned by DisgruntledGoat you as well can have a look to the users site, some of them have listed their site next to their account information. However, a showcase as well would be a great idea.
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.