Brainstorm is an open-source application for MEG/EEG data analysis, emphasizing cortical source estimation and integration with anatomical MRI data. It provides a user-friendly graphical interface (GUI) to connect MEG/EEG researchers with established and cutting-edge methods. The software is designed for ease of use, with a focus on data visualization and processing. It supports a wide range of file formats for MEG/EEG recordings, anatomical MRI data, and sensor locations. Brainstorm includes extensive preprocessing pipelines for MEG/EEG data, including noise reduction, artifact detection, and statistical analysis. It also offers advanced visualization tools for sensor and source data, as well as anatomical surfaces and volumes from MRI. The software supports forward and inverse modeling for source estimation, including methods like the single sphere and overlapping spheres for MEG, and Berg's three-layer sphere model for EEG. Brainstorm also includes time-frequency analysis, group analysis, and statistical thresholding for source maps. It features a graphical batching interface for automated processing and a high-level scripting environment for advanced users. Brainstorm is freely available and continuously updated, with a large user base and active community support. It is compatible with multiple platforms and is used in both clinical and research settings for MEG/EEG data analysis. The software is part of a broader open-source movement in neuroscience, offering accessible tools for data analysis and visualization.Brainstorm is an open-source application for MEG/EEG data analysis, emphasizing cortical source estimation and integration with anatomical MRI data. It provides a user-friendly graphical interface (GUI) to connect MEG/EEG researchers with established and cutting-edge methods. The software is designed for ease of use, with a focus on data visualization and processing. It supports a wide range of file formats for MEG/EEG recordings, anatomical MRI data, and sensor locations. Brainstorm includes extensive preprocessing pipelines for MEG/EEG data, including noise reduction, artifact detection, and statistical analysis. It also offers advanced visualization tools for sensor and source data, as well as anatomical surfaces and volumes from MRI. The software supports forward and inverse modeling for source estimation, including methods like the single sphere and overlapping spheres for MEG, and Berg's three-layer sphere model for EEG. Brainstorm also includes time-frequency analysis, group analysis, and statistical thresholding for source maps. It features a graphical batching interface for automated processing and a high-level scripting environment for advanced users. Brainstorm is freely available and continuously updated, with a large user base and active community support. It is compatible with multiple platforms and is used in both clinical and research settings for MEG/EEG data analysis. The software is part of a broader open-source movement in neuroscience, offering accessible tools for data analysis and visualization.