Rss-feeder is a project mainly written in Clojure, it's free.
Clojure RSS Feed Project
java -jar rss-filter.jar -h
java -jar rss-filter.jar -k <URL> <keyword>
lein uberjar rss-filter.jar
java -jar rss-filter.jar -k "http://feeds.delicious.com/v2/rss/popular/programming" "Programming"