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The database is free but requires registration.
And the database is free for the public to search at Topsy.com.
The database is free, and contains citations and abstracts of systematic reviews, and critically appraised randomized controlled trials relevant to occupational therapy.
The database is free and its full text can be searched, meaning that any part of the patent can be used as a search word, including the patent number, inventor name, issue date, or words and phrases from the description of the invention.
Mendeley's database is free under a Creative Commons license.
The database is free to Duke students, faculty and staff here.
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Posting a profile and browsing the database are free, but it costs about $1.25 to initiate a 20-minute instant messaging session with someone.
All the tools used to build the Bellingcat Vehicles database are free and require no special expertise.
The authors, who are all members of the Advisory Committee to the International Nucleotide Sequence Database Collaboration (INSDC), note that "[a]ccess to the INSDC's databases is free and unrestricted, enabling researchers to plan experiments and to analyze existing data.
Most databases are free; some need individual registration; a few need individual registration and small payments.
Some trademark databases are free to search, while others may cost a small fee.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com