FieldTrip is Open Source software and you can use it freely under the GPL license without other restrictions. However, we do appreciate getting acknowledged for the contribution of our project to your research. Please note that your references to FieldTrip also help us to ensure continued funding for the FieldTrip project, code development and support.
If you have used FieldTrip for the analysis that you are reporting on in a scientific publication, we kindly ask you to refer to the following publication
When pointing to the FieldTrip website, please use the URL http://www.ru.nl/donders/fieldtrip which also acknowledges our university and institute, instead of the short-hand http://fieldtrip.fcdonders.nl where the site is technically hosted. The latter address with fcdonders in the name will not remain available in the future.
Publications that are referring to FieldTrip are listed here.
Publications that describe (some of) methods that are implemented are listed here.