2019-10-12 UTC
# 
@AndreJaenisch ↩️ Official spec: https://www.w3.org/TR/webmention/
Known software: https://indieweb.org/Webmention#Publishing_Software
SaaS: https://indieweb.org/Webmention#webmention.io
My inherited take on implementation: https://github.com/Ryuno-Ki/webmention-tools
AFAIK no implementation in Racket. But you could use a CLI for it in interim. (twitter.com/_/status/1182899056915505153)