The following search engines are based on semantic technologies, and most of them uses some natural language technique to improve the search result.
Feel free to comment and suggest other upcoming search engines.
General search engines
- Wolfram Alpha (http://www.wolframalpha.com/)
- Powerset (http://www.powerset.com/)
- Trueknowledge (http://www.trueknowledge.com/)
- Evri (http://www.evri.com/)
- Hakia (http://www.hakia.com/)
Specific search engines