I am used to read RFC documents in Emacs by opening them as simple text files. But I was always annoyed by the impossibility to follow references to other documents. Additionally, searching for the right RFC usually involve going back to the web browser and Google while I would prefer staying in Emacs.
Since I enjoy Helm so much, I thought it would be easy to parse the index of all RFC documents, and create a browser allowing me to pick a RFC. And since I was writing some elisp, I ended up writing a major mode to highlight parts of RFC documents, including adding links when another RFC is mentioned.
So here is rfc-mode. It is quite simple for the time being, and I have a few ideas for more features, but it is already quite useful.
It is also available on MELPA.