A medical software application for viewing and analyzing medical timeseries data - EEG, EMG, ECG, et cetera. Supports multiple file formats, multiple operating systems, annotations, multiple files simultaneously.
F/OSS software for developing brain/computer interfaces. Compatible with a fair number of commercial EEG devices. Runs on Windows as well as Linux.
Open Ephys is a site that catalogues open source neuroscience hardware - EEGs, data acquisition boards, EMGs, and other bits of equipment that manufacturers historically never manufactured very well.