Talkwalker Alerts - Better than Google Alerts
Mentioned By - Learn when your site is mentioned by other sites for free
Charm - A little companion app for collecting Tweets
mention - Media monitoring made easy with Mention. Create alerts on your name, brand, competitors and be informed in real-time of any mention on the web and social networks
Warble - Daily Email Alerts for Twitter
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!