Embase includes MEDLINE along with more international literature and conference abstracts, and uses Emtree indexing terms instead of MeSH, which may allow you to find different results. Embase also offers more flexible adjacency searching than PubMed, letting you search for terms that appear within a certain number of words from each other.

The Ovid platform allows more search customization for advanced users, including more flexible search adjacency options, allowing you to search for terms when they appear close to each other.

Scopus is a large, multidisciplinary database that includes MEDLINE. It specializes in allowing you to see who has cited whom and creates author profiles.

Web of Science is a large, multidisciplinary database that includes MEDLINE. It specializes in allowing you to see who has cited whom and creates author profiles.

An alternative interface to PubMed for searching the MEDLINE database, and the interface is created by a French Society of the same name. BibliMed includes both a simple search option that is accessible without registration and an advanced search option (BibliMed+) that's available for free with registration. BibliMed+ includes the additional features of: History and export options, Clinical filters, and Advanced search options (therapeutic use, drug effects, methods, etc).

An integrated, generic tool for summarization, drill-down and browsing of PubMed search results that accommodates a wide range of biomedical users and needs. It is a web-based tool that processes articles retrieved from PubMed and displays multiple aspects of the articles to the user, according to pre-defined categories such as the "most important" words found in titles or abstracts; topics; journals; authors; publication years; and affiliations.

An alternative search interface to the PubMed database of biomedical literature, incorporating external web services and providing functions to improve the efficiency of literature search, browsing and retrieval. Users can create and visualize clusters of related articles, export citation data in multiple formats, receive daily updates of publications in their areas of interest, navigate links to full text and other related resources, retrieve data from formatted bibliography lists, navigate citation links and store annotated metadata for articles of interest.

Allows you to search the metadata of literature with digital object identifiers (DOIs).

A resource from European Molecular Biology Laboratory’s European Bioinformatics Institute that "integrates content from a range of sources such as PubMed, PubMed Central (PMC), Agricola, and 34 life science preprint servers including biorxiv, Research Square, and Preprints.org."

"The Lens scholarly works MetaRecords include the following primary data sources: Crossref, PubMed, OpenAlex and Microsoft Academic (discontinued), with supplementary data from additional data sources including Unpaywall, OpenCitations, DOAJ, ORCID, ROR, PMC and publishers such as Springer Nature."

"Europe’s largest search engine for literature and information (research data) in the field of life sciences," from Germany's ZB MED – Information Centre for Life Sciences. The organization is currently working on Open Life Science Publication database (OLSPub), which is being put forth as a PubMed alternative.