qRFCView is a viewer for IETF RFCs. Advantages are:
* automatic table of content, with direct opening of section
* handling of RFC internal cross-references
* automatic downloading of a referenced RFC from the IETF web site on
  a simple click
* caching of RFC in a local directory
* tab-browsing of RFC
* searching

WWW: https://web-beta.archive.org/web/20130618220115/http://qrfcview.berlios.de/