Upstract - Digg 1.0 meets the mother of news aggregators
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.
Summit - Summit delivers news that matters to you, but with a twist. As a news aggregation software, breaking stories are collected, summarized and visually grafted into interesting infographics to keep you updated on current events while on-the-go.
Twitterrific - Twitterific is an app that offers several functions and fun features for your Twitter account.
NewsGIF - A community-created Daily Show entirely in GIFs
Fenix for Twitter - A fresh Twitter experience, for Android