Unofficial Zotero server: search your library, add papers by DOI, import PDFs, cite in Word
Free
One server, in research. Unofficial Zotero server: search your library, add papers by DOI, import PDFs, cite in Word
Research
Unofficial Zotero server: search your library, add papers by DOI, import PDFs, cite in Word
The rest either hold an API key issued by the publisher or ask for nothing.
Listed without a verification tick. Read the listing before installing.