The Chemical Reference Resolver is an invaluable tool for quickly directing you to a publisher's webpage that contains the article you are looking for. However many of the publications are now also available on preprint servers and are accessible for free even if the final publication is behind a paywall.
To search for open access versions simply prepend your doi string with the word "oadoi" and press Enter.
Full details are in this blog post http://kovsky.net/blog/posts/oadoi-resolving.
Sci-Hub is a web service that provides free access to research articles and latest research information, the website uses donated library credentials of contributors to circumvent publishers’ paywalls and thus downloads large parts of their collections. In 2016 Sci-Hub released data on ~28 million downloads done through the service and in 2017 Sci-Hub released the list of ~ 62 million Digital Object Identifiers (DOIs) of the content they have stored.
A recent publication DOI describes a detailed analysis of Sci-Hub usage and as you can see in the plot below taken from the article chemistry journals (shown in red) are particularly popular.
With Safari 5 one of the most interesting new features is the support for Extensions and there are now many different [extensions availabl(https://safari-extensions.apple.com).
There are a section of extensions that might be of interest to scientists and I've started listing the here.
I've just created a new extension that might be of interest.
Ever come across an interesting paper that is behind a paywall? Many of these publications may also be available via green open access.
Self-archiving, also known as green open access, refers to the practice of depositing articles in an institutional repository or a subject repository such as arXiv.
However locating the open version can be a bit hit and miss given there are so many potential repositories. Fortunately oaDOI provides a simple way to search for open access versions
You can simply paste the DOI into the search engine at oadoi.org, however this web service is ideal for linking to a Safari Extension.