Cite & Download Journal Articles and Scientific Papers

Citationsy Archives lets you search for scientific papers and journal articles, download them, and of course cite them in your Citationsy projects.
After entering a query it searches through all published papers in the world and shows you the matches. You can then click a result to see more details, and immediately cite it from there. It will also let you download the paper through a couple different open access services like oaDOI and Unpaywall.

See it in action:

CitationsyArchives Screenshot

Second CitationsyArchives Screenshot

Third CitationsyArchives Screenshot