If you ever need an open source web application that can fetch content from any number of sources, you definitely need to check out selfoss. This lightweight (less than 2 MB) web application by default can fetch content from RSS feeds but, having a great plugin system you can extend it to grab any type of information (log files, emails, etc). The implementation is very simple and only requires a new class to be added.
This RSS reader/aggregator application has a simple interface that also supports navigation via keyboard. Selfoss also comes with mobile support (Android, iOS, iPad) and its good if you want to collect all your posts, tweets, feeds, etc in one place. To install it you need a personal (or shared) server that supports PHP and one of this database options (MySQL, SQLite, MongoDB).
Open source RSS reader/aggregator: Example