I am in the process of moving FeedMasher a web aggragation framework I have worked on for several years to open source. Details here: http://www.feedmasher.org/ Feedmasher is a system that is capable of gathering digital content from a wide array of sources such as traditional RSS feeds (ex: newsfeeds from cnn, bbc etc.) Twitter tweets, Youtube Videos, Instagram and more.
Once data is fetched from an outside source it is pulled into the Feedmasher component and standardized. It can than be displayed in various ways and arrangements. For example: a channel on Arts in Rochester NY could display stories from multiple sources such as a local artists Youtube channel, the latest news from the MAG art gallery, tweets from prominent local artists and more. As opposed to having to visit dozens of individual sites it can be fetched and curated in one single spot!