Exporting a CSV from LibreOffice
Gravity Forms does not include entry import functionality. GravityImport is the best way to import data into Gravity Forms from a CSV.
LibreOffice is an open-source, completely free office suite. If you want to export your entries from LibreOffice into Gravity Forms, this guide is for you!
Under File, select Save As (not Export)

Then, select Text CSV (.csv) from the file type dropdown

In the export options, set the character set to Unicode (UTF-8)

Keep the field delimiter as a comma, then click OK to export your file. GravityImport expects UTF-8 CSV files, so this character set keeps accents and special characters intact. An older version of this guide said to select UTF-16; use UTF-8 instead.
Importing Your File into Gravity Forms
To import your CSV file into Gravity Forms, follow this guide.