These GUIs are now hosted at the DSP-First Companion Website
Most of these GUIs appear in the textbook DSP First (2nd edition), and also in the textbook Signal Processing First, published by Pearson Education / A Pearson Education Company / Upper Saddle River, New Jersey 07458
The Graphical User Interfaces on this page were developed by members of the Center for Signal and Information Processing (CSIP) in the School of Electrical and Computer Engineering at the Georgia Institute of Technology.