Rss2mail is a project mainly written in Java, it's free.
RSS to eMail example
This example shows how to retrieve an RSS feed, split it into individual messages and send each message to an eMail recipient.
v1: introduce the example, everything in one flow v2: add idempotency v3: refactor for unit tests v4: add quartz polling
This example is discussed in a series of blog posts:
http://blogs.mulesoft.org/feed-my-inbox-reading-rss-feeds-with-mule-esb http://blogs.mulesoft.org/feed-my-inbox-reading-rss-feeds-with-mule-esb-part-2