Here is a list of implementations: http://www.packetizer.com/webfinger/
- Go: https://github.com/ant0ine/go-webfinger (Draft 5)
- NodeJS: https://npmjs.org/package/webfinger (Draft 9 and fallback to host-meta)
- Pear Package: http://pear.php.net/package/Net_WebFinger/ (Draft 13 and fallback to host-meta)