The codes include implementation of Butterworth filter, iFFT/FFT, feature extraction and normalization, training/test, and prediction confidences computation.
LIBLINEAR is an SVM tool that outputs the model weights, i.e., w, with w, prediction confidences computed. Official site is here. To install it in MATLAB via this answer.
Some other tools used in WiPIN:
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Linux CSI tool, here. If the Unix time stamps required, please check this modification.
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Linear Discriminant Analysis or PCA tool can be found here.
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Support Vector Regression tool, i.e., LIBSVM, can be found here (LIBSVM cannot compute prediction scores).