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Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.
elicit - elicit is an on-site search software for internet, mobile devices and social media.
SLI Systems - SLI Systems
ResearchGate - Access scientific knowledge, and make your research visible
Sooqr - Sooqr Search provides relevant and innovative site search engine for the website.
CiteSeerX - CiteSeerx is an evolving scientific literature digital library and search engine that has focused primarily on the literature in computer and information science.