I'm using the Wappalizer Chrome extension to get a quick overview of which technologies a site is using:
https://chrome.google.com/webstore/detail/wappalyzer/gppongmhjkpfnbhagpmjfkannfbllamg?hl=en
Currently it only mentions:
It's fairly easy to add Flarum but I don't know what the best way would be to fingerprint Flarum in a stable way:
https://www.wappalyzer.com/docs
