NEX is a specialized file format used for storing neurological data, which is then used to conduct further analysis and for experimentation and statistical purposes. NEX file extension was developed by Plexton.

Data stored in NEX files can be accessed with Neuroexplorer, a tool for Microsoft Windows. Neuroexplorer is a paid software tool (a trial version is an option). The developer of this program offers a comprehensive documentation and a complete user manual.