Exalead
The best search engine out there
BeVigil
CiteSeerX
Google Custom Search
Harmari (Unified Listings Search)
WIPO
WorldWideScience.org
Censys Search
Discovery | The National Archives
FindSounds
Google Patent Search
Indeed - CSE
Lumix Shoppy Search Engine
MAC Address Lookup
Public Buckets
Research Guides: Think Tank Search: Think Tank Search
Search Engine Forums - SEO Tools, Communities, Blogs, Podcasts and Conferences
Stork Search
Textise
Text-Only and Accessibility Tools
Wiby
Ä1 - All In One Advanced Search
Sploitus Exploit Search Engine
Zanran (Google for Data)