#(FREE) community  https://github.com/Emotiv/community-sdk
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Emotiv SDK Community Edition 3.4.0
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Functions:
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1) Facial Expressions; [Hard to train, Bad]
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2) Mental Commands; [Hard to train mixed commands]
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3) 9 Axis Inertial Sensors; [Good]
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4) FFT (Frequency Bands)
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Emotiv SDK Community Edition 3.4.0
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Platform: Win10 64bit
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Program: run on Visual Studio 2017 (samples’ platform VS13) / MATLAB, Unity,...
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API doc: <a href="http://emotiv.github.io/community-sdk/">http://emotiv.github.io/community-sdk/</a>
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Language: C++(mainly)
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Reference: <a href="https://emotiv.zendesk.com/hc/en-us">https://emotiv.zendesk.com/hc/en-us</a>

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*Most samples are of connection detection, having few effect on application development.
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*Most samples are of command window projects, among which some have UIs.