elicit - elicit is an on-site search software for internet, mobile devices and social media.

Google Scholar - Google Scholar is a freely accessible web search engine that indexes the full text of scholarly...

Scinapse - Scinapse is a free, nonprofit, Academic search engine for papers, serviced by Pluto Network.

SemanticScholar - An academic search engine that utilizes artificial intelligence methods to provide highly relevant results and novel tools to filter them with ease.

ResearchGate - Access scientific knowledge, and make your research visible

Scopus - Scopus is a bibliographic database containing abstracts and citations for academic journal articles.