F5Bot - F5Bot will send you an email whenever your brand, product, or keyword is mentioned online.
Boreal - A Hacker News iOS app
Google Alerts - Google Alerts will send you email or RSS updates of the latest relevant Google results (web, news...
Groouply - Track keywords on Facebook groups
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
MackerNews - Beautiful Readable Hacker News Articles