In the "notes" section, there is a difference between: In the case of web applications, this describes the server OS.
This table lists the machine-readable file formats that can be exported from reference managers.
This table lists the file formats which may be manually imported into the reference managers without needing to connect to one particular database.
This table lists this type of support for Microsoft Word, Pages, Apache OpenOffice / LibreOffice Writer, the LaTeX editors Kile and LyX, and Google Docs.
This table lists the academic databases and search engines which reference managers can import from.