JARR (which stands for Just Another RSS Reader) is a web-based news aggregator and reader.
JARR is coninuingly ongoing developments and functionnalities are regularly added. To check on those see the CHANGELOG. However JARR is stable and can function as easily on a light installation with the python SimpleHTTP server and a SQLite database or on a more heavy setup with nginx or apache running against a PostGreSQL database.
A documentation is available here. It will provide you several ways of installing the software as well as using the REST API.
JARR is under the GNU Affero General Public License version 3.