EBSCO Discovery Service indexes a large high-end full text collection of content as well as entire library collections. EBSCO’s resources are available in hundreds of thousands of institutions worldwide.
DOAJ is a community-curated list of open access journals and aims to be the starting point for all information searches for quality, peer reviewed open access material.
J-Gate is the largest E-journal database containing global content from various
OCLC WorldCat is an online computer library containing high quality, global
Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines.
Semantic Scholar is a project developed at the Allen Institute for Artificial Intelligence. Publicly released in November 2015, it is designed to be an AI-backed search engine for scientific journal articles. Semantic Scholar is designed to highlight the most important and influential papers, and to identify the connections between them.