The following is a list of formats for web feeds for web syndication where content is made available from one website to other sites.

Major markup languages

  • Atom
  • RSS

Minor markup languages

  • FeedSync
  • GData Google Code
  • hAtom
  • Hina-Di
  • LIRS
  • NewsML
  • NewsML-G2
  • EventsML-G2
  • SportsML-G2
  • ICE
  • OCS
  • OPDS
  • OML
  • OPML
  • RDF feed
  • RSS enclosure
  • Simple List Extensions
  • SyncML
  • XOXO
  • PubSubHubbub

Specialized markup languages

  • EventRSS - for social events
  • GeoRSS - for transferring geoinformation
  • Media RSS - for transferring Media content

Historical

  • CDF
  • Marimba
  • MCF
  • NewsML 1
  • PointCast
  • SportsML