Open Source Literature Review Search Tools: Free and open source software useful for open source literature reviews

One-click access to free copies of research papers whenever you hit the paywall

The Open Access Button is a browser bookmarklet which registers when people hit a paywall to an academic article and cannot access it. It is supported by Medsin UK and the Right to Research Coalition.

Unpaywall searches the Unpaywall database which works by harvesting from Open Access sources to find OA content and then matching that content to the Crossref DOI, so for any DOI searched via the plugin, Unpaywall "knows about any OA versions that exist anywhere". The Unpaywall extension is already integrated into a number of discovery tools and platforms, including Scopus, Web of Science

EndNote Click provides a link to the "best available full-text PDF" of an article and works in the same way as other OA browser extensions; by searching for an OA version on open databases on the Internet.

FIND OPEN ACCESS
There are more than 25 million Open Access versions of otherwise “paywalled” scientific articles, however they are often not easy to find.Open Access Helper for iOS & macOS is designed to help you get easy access to these documents, with a lot of help from some amazing APIs.

This extension for Firefox adds a browser button for easy access to Google Scholar from any web page. Click Scholar Settings (you may need to login with your libthe Scholar button to:
Find full text on the web or in your university library. Select the title of the paper on the page you're reading, and click the Scholar button to find it.
Transfer your query from web search to Scholar. Press the Scholar button to see top three results; click "full screen" in the lower left of the popup to see them all. Format references in widely used citation styles. Press the quote button under the result to see a formatted reference and copy it into the paper you're writing.Save the article to your Scholar library, so you can read it or cite it later. Press the blue star under the result to save it, or the gray star at the bottom to see all saved articles.
Library links work best when you're on campus.To search the US case law, click the gear icon at the bottom of the popup, and configure your preferred collection in Google Scholar Settings.

Extension for Chrome

helps you determine the degree of authenticity of open access journals requiring or hiding article processing charges (APCs) using a criteria-based evaluation

It is important to realise that ‘quality’ in the context of QOAM relates to the quality of a journal’s service to authors, rather than to a hypothesized quality of a journal’s scientific and scholarly content as based on citation metrics.

In QOAM, academic authors score the experience they have had with the journal’s peer review and editorial board from 1 to 5 via a concise journal score card. The QoS indicator of a journal is then defined as the product of the average score of the journal and the ‘robustness’ of this score.