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