Every forum provides forum RSS feeds of messages sent to the forum. Every discussion thread also provides RSS feeds. You can get access to RSS link on every forum/thread page.
Ticket system provides various RSS feeds. You can find the RSS file for frequently used search queries in the list on the page of the link above. You can also get RSS for the search queries personally specified by you, and RSS for each ticket. For more details, go to the page of this link/help.