Unity is a cross-platform game engine that can be used to create experiments with more complex interactivity and/or more elaborate audiovisual content, such as full 3D virtual environments. Unity is free for personal/non-commercial use.
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The lab streaming layer (LSL) is a system for the unified collection of measurement time series in research experiments that handles both the networking, time-synchronization, (near-) real-time access as well as optionally the centralized collection, viewing and disk recording of the data.