Timeline - Timeline is a cross-platform application for displaying and navigating events on a timeline.
Listr - Listr lets you explore some of the best lists on Twitter, curated across your favorite categories.
MyTweetAlerts.com - Like Google Alerts for Twitter
Setalist - The easiest way to make awesome lists for the internet
SOCIALHOSE.IO - Discover an enterprise social listening platform that enables brands & agencies to monitor the web & listen to their audience, built to scale. Start for free!
xZeitgeist - The most popular tweets categorized and ranked, every day