Talkwalker Alerts - Better than Google Alerts
Timeline - Timeline is a cross-platform application for displaying and navigating events on a timeline.
Charm - A little companion app for collecting Tweets
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!
Warble - Daily Email Alerts for Twitter
Vicariously.io - Create Twitter lists based on the follows of other users