FieldTrip

The MATLAB software toolbox for MEG and EEG analysis

FieldTrip is the MATLAB software toolbox for MEG and EEG analysis that is being developed by a team of researchers at the Donders Institute for Brain, Cognition and Behaviour in Nijmegen, the Netherlands in close collaboration with collaborating institutes.
FieldTrip offers advanced analysis methods of MEG, EEG, and invasive electrophysiological data, such as time-frequency analysis, source reconstruction using dipoles, distributed sources and beamformers and non-parametric statistical testing. It supports the data formats of all major MEG systems (CTF, Elekta/Neuromag, 4D, Yokogawa) and of most popular EEG systems, and new formats can be added easily. FieldTrip contains high-level functions that you can use to construct your own analysis protocols in MATLAB. Furthermore, it easily allows developers to incorporate low-level algorithms for new EEG/MEG analysis methods.
Furthermore, it offers a frequently updated website [1] with tutorials, example data and other documentation. There is an active community centered around the email discussion list [2].

FieldTrip is the mostly used software for MEG data analysis and developed in close collaboration with related open source projects, such as EEGLAB, SPM, BrainStorm and MNE.

Please cite the FieldTrip reference paper [3] when you have used FieldTrip for data analysis in your study.

[1] http://www.fieldtriptoolbox.org
[1] http://www.fieldtriptoolbox.org/discussion_list
[2] http://dx.doi.org/10.1155/2011/156869