"Follow That Page is a change detection and notification service that sends you an email when your favourite web pages have changed. We monitor the web for you.
Message to Glastonbury fans: many of you come to us hoping that Follow That Page will alert you when extra tickets are available. However, it appears they have currently blocked our service from monitoring their site. So please don't expect too much."
Social Mention is a social media search and analysis platform that aggregates user generated content from across the universe into a single stream of information. It allows you to easily track and measure what people are saying about you, your company, a new product, or any topic across the web's social media landscape in real-time. Social Mention monitors 100+ social media properties directly including: Twitter, Facebook, FriendFeed, YouTube, Digg, Google etc.
seekda™ is the free search engine for Web API (Web Services at the moment) and their providers. We run a focused crawled that gathers information about services available on the Web and we monitor these services daily. We also allow our users to edit certain data regarding providers or their services.
TextMap is a search engine for entities: the important (and not so important)people, places, and things in the news. Our news analysis system automatically identifies and monitors these entities, and identifies meaningful relationships between them.