Locating scholarly and peer-reviewed resources online is a relatively easy process. However, some websites will limit the availability of full content without a paid subscription or membership. Here are a few searchable sources; each of them offering links to open access scholarly content.

Paywall Ratings: $ to $$$ (Ratings are based on the frequency of paywall links for access).

Google Scholar

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.

Paywall Rating:  $

Google Books

Google Books finds a book with content that contains a match for your search terms and will link to it in your search results.

Paywall Rating:  $


RefSeek is a web search engine for students and researchers that aims to make academic information easily accessible to everyone. RefSeek searches more than one billion documents, including web pages, books, encyclopedias, journals, and newspapers.

Paywall Rating:  $

Microsoft Academic

Microsoft Academic offers highly relevant search results from continually refreshed and extensive academic content from over 120 million publications.

Paywall Rating:  $$

Semantic Scholar  - NEW!

Since 2015, Semantic Scholar has been enhancing the way researchers find scientific publications. Use it to locate computer science & medical research papers faster with an AI-based discovery engine.

Paywall Rating:  $$$


Wolfram|Alpha is a unique engine for computing answers and providing knowledge. It works by using its vast store of expert-level knowledge and algorithms to automatically answer questions, do analysis and generate reports.

Make sure you complete the tour; this website has so much to offer!

Paywall Rating:  Free

The CIA World Factbook 

The World Factbook provides information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 267 world entities.

Paywall Rating: Free

Directory of Open Access Journals (DOAJ)

DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.

Paywall Rating: Free

Google Translate

Google's free service instantly translates words, phrases, and web pages (PDF too!) between English and over 100 other languages.

Translate foreign journals and research using Google Translate!

SCImago Journal & Country Rank

All scientific journals are not equal. SCImago Journal ranks a journal's impact, influence, and prestige.

Open Access Explained!

Video via YouTube by Piled Higher and Deeper (PHD Comics)