gregaire is an online news aggregator written in PHP5 with MySQL or SQLite backend. The software is not only GPL'd but also available as a service (so you don't have to install it) under my.gregaire.com. There is also a demo account available.
The whole project looks really very very interesting esp. as you can also download the software and install it on your own server if you want ;-)
For more information check out
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Alternatively, this website also supports Webmentions. If you write a post on a blog that supports this technique, I should get notified about your link 🙂