Carrot2 is an Open Source Search Results Clustering Engine. It can automatically organize (cluster) search results into thematic categories.
TilTul - Links you want to remember Online Bookmarks of Favorites useful links. Try search results from Google with pictures, Virtual multilingual keyboards and much more.
Search suggestions and completions from the top providers on the internet. Easy to use, fast and efficient. Hit the right arrow to change engines, and use your arrow keys to search without all the typing. Let the web help.
Kngine - Your intelligent assistant (iPhone, Android) The app that answers your questions - Ask me anything http://beta.kngine.com