Groouply - Track keywords on Facebook groups
Syften - Better social media keyword alerts
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
HNwatcher - Track keywords and users on Hacker News
Google Alerts - Google Alerts will send you email or RSS updates of the latest relevant Google results (web, news...
Fresh Web Explorer - Far Superior Alternative to Google Alerts