Web | Documents
Second most popular search engine in the United States developed by Microsoft.
Preeminent search engine indexing billions of pages.Yahoo!
Widely used search engine powered by Bing.
meta search enginesCarrot2
Open source meta search, clustering, and search visualization engine.
Search service with a clean interface and an emphasis on user privacy.
Combines the top results of multiple engines--primarily Gigablast and Yandex.
Clustering and meta search engine by Vantage Research.
Meta search and semantic clustering engine by Vivisimo.
academic search enginesBASE
Operated by Bielefeld University Library, BASE provides an index of over 100M documents.
Innovative search service that surfaces key facts, relationships, and quizzes from results.
Web and document search engine for students and researchers.
refseek.com | Also see: Document SearchResearchGate
Search large volumes of self-published scientific research material.
international search enginesBaidu
Leading search engine in China.
Russia's most popular search engine for web, news, and media.