Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.
Trimmed News - News aggregator that uses AI to summarise the news
Twitterrific - Twitterific is an app that offers several functions and fun features for your Twitter account.
Upstract - Digg 1.0 meets the mother of news aggregators
Fenix for Twitter - A fresh Twitter experience, for Android
Google News - Comprehensive up-to-date news coverage, aggregated from sources all over the world by Google News.