Letswave is a free, open-source Matlab toolbox to analyze EEG/MEG and other neurophysiological signals. The toolbox is hosted on Github.. As compared to other signal processing toolboxes, emphasis is placed on intuitive and streamlined tools to process and visualise EEG data, with a shallow learning curve. The new version provides advanced scripting possibilities. The project is managed by André Mouraux (Institute of Neuroscience, Université catholique de Louvain, Belgium), in collaboration with Gan Huang (Shenzhen University), Bruno Rossion (Institute of Neuroscience, Université catholique de Louvain), Li Hu (Southwest University, China) and Giandomenico Iannetti (University College London, UK).