PubMed.gov - PubMed comprises more than 29 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
Screenshot Machine - Screenshot machine is an online website capturing service. Creates a screenshot or thumbnail of any online web page in couple of seconds for free.
Biohunter - Biohunter is a one-stop portal for literature search, batch-download PDFs and reference manager
URL2PNG - Screenshots as a Service. Capture snapshots of any website, right in your app, quickly and reliably.
Hubmed - An alternative interface to the PubMed medical literature database.
ApiFlash - ApiFlash is a powerful serverless screenshot API built with Chromium and AWS Lambda. It can easily scale to millions of screenshots per day and has an ever growing number of satisfied big clients.