rss2imap is a tool which gets RSS (RDF Site Summary) from web and delivers to the IMAP server as an e-mail message. it enables you to use IMAP supported MUA as a RSS reader, and to unify mail check and site update check with ONE client.
WWC (Which Website Changed) is a tool that visits a user-provided list of websites and notifies the user if any of them has changed. It is designed to be run by cron once a day.