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Scientific literature is vast and increasing every day. In addition to the databases provided by the library, these open resources may be useful to you too. All are either completely free to anyone to use, or have a free version and a for-fee version with more tools. Artificial intelligence and metadata mining are involved, monetization is not always clear.
Non-library literature discovery tools available free (ish) to all
Type in a single citation, and it builds a map of related papers. Uses Semantic Scholar (from AIII in Seattle), about 200 million articles, including preprints. Tells you what exists, but doesn't get you to the full text.
Open Knowledge Maps
A visual interface to the world's scientific knowledge. Choose from PubMed metadata or open-source Bielefeld Academic Search Engine (BASE, 270 million documents), includes preprints, curated to avoid spam.
Crawls (indexes) the content of publishers' websites, scholarly journals, indexes, academic websites, institutional repositories, etc. to find information of a scholarly nature. Does not provide comprehensive coverage of any one field. Enter through the library's website so that you will be linked to the library's licensed resources.
Monitors news, blogs, RSS feeds, Reddit, Twitter, podcasts, etc. Free version and also a for-fee premium version also available.
"Spotify for papers". You must create a personal account before you can see anything. You add papers of interest, the Rabbit finds similar content for you.
For-profit social network for scientists, with added PDFs. Not open - requires personal account creations. For-fee premium model available. You have to create a personal account before you can see anything. Yes, your personal data will be collected.