The best open source alternative to Google Alerts is Meta-Press.es, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 25 alternatives to Google Alerts, but unfortunately only two of them is open source.
Decentralized search engine & automatized press reviews. Explore the press from your computer, with no middlemen between the newspapers and you. Discover millions of results within seconds, and explore the last ones in Firefox via this addon.
Rufus is a free, open-source web based RSS reader, designed to be both simple and fast. It can be built and managed locally following the instructions below, or accessed at the public instance. Rufus is written in Java atop Dropwizard.