openaccess.xyz search engine

Here's a description of this tool from a companion blog post:

http://timothymccallum.com.au/wordpress/search-engine-for-open-access-research-articles/#comment-17

"...The result is openaccess.xyz a website which allows anyone to dive into billions of words which are stored in the millions of OA research papers. That's not all...Whilst users are able to chart frequencies and plot the usage of words over time, this Bookworm also allows users to click on the graph at which point a link to OA research papers is provided. Now millions of research papers are literally just a few clicks away and because the Bookworm only harvests university IRs there are no publisher pay-walls, pop-ups or advertising...."