1- Google Scholar: Google Scholar was founded in 2004 and displays a large number of articles from online sources and journals. This database is very popular and accessible to researchers.
2- CiteSeerx: CiteSeerx is a digital library and online academic journal that provides researchers with articles in the field of computer science. Founded in 1998, this database was the first online database to be made available to researchers and scholars.
3- GetCITED: This database includes 3 million articles with more than three million authors. This database is also one of the powerful scientific databases that has two special features that make it more prominent compared to other scientific databases: 1- It is a comprehensive database. 2- It provides a discussion forum for researchers to exchange opinions and information online and offline.
4- Microsoft Academic Research:
This database, founded by Microsoft Research, contains more than 48 million articles and other scholarly works from more than 20 million authors. You can search for articles in a variety of academic disciplines.
5- Bioline International:
This database is another scientific database that was established in 1993. It is interesting to know that this database indexes articles from third world countries (15 countries). Most of the articles in this database are in the fields of agriculture, farming, health, food and medicine and health. This database contains articles from 70 journals.
6- Directory of Open Access Journals:
This database is another rich and powerful scientific database that offers articles from about 8,000 journals in various topics and fields.
7-PLOS ONE: This is a very powerful database that indexes journal articles that have been accepted after rigorous peer review. You can find many articles from academic publications on this database.
8-BioOne: An exceptional scientific database for finding articles in the fields of natural sciences, biology, and ecology. Founded in 2008, this database was initially an NGO that has since become a database. This database indexes articles from more than 25,000 institutions around the world.
9- Advanced Science and Technology Articles (Science and Technology of Advanced Materials):
This database was founded in 2000 and indexes various articles in the field of science and technology. Most of the articles in this database are made available to researchers for free.
10- New Journal of Physics:
This database was established in 1998. This database was developed and designed by the Institute of Physics and Deutsche Physikalische Gesellschaft, and presents the latest developments in physics through indexing articles from physics journals.
11- ScienceDirect: A database that provides the full text of scientific journal articles as well as sections of scientific books from more than 2,500 journals and 20,000 books.
12- Synapse search engine:
In addition to these search engines, another search engine was founded in South Korea in 2018 called Synapse, which contains 170 million articles.
