http://scikits.appspot.com/talkbox
http://bmcfee.github.io/librosa/
http://thomas-cokelaer.info/software/spectrum/html/contents.html
http://nipy.org/nitime/index.html
https://github.com/MTG/sms-tools
http://pythonhosted.org/audiolazy/
http://ajaxsoundstudio.com/software/pyo/
Bob (signal-processing and machine learning toolbox)
http://idiap.github.io/bob/
Speech Signal Processing:
https://github.com/idiap/ssp
http://siggigue.github.io/pyfilterbank/, https://github.com/SiggiGue/pyfilterbank
https://github.com/fakufaku/AudioTools
Signal Processing for Communications Jupyter notebooks with examples, free PDF book, MOOC
MIT opencourseware video lectures: Signals and Systems (Alan V. Oppenheim), Digital Signal Processing (Alan V. Oppenheim)
Soundpipe (C library): http://paulbatchelor.github.io/proj/soundpipe.html, https://github.com/PaulBatchelor/Soundpipe
libaudioverse, A (C++) library for 3D and environmental audio:
http://camlorn.github.io/libaudioverse/docs/branches/master/libaudioverse_manual.html
https://github.com/camlorn/libaudioverse
Python bindings: http://camlorn.github.io/libaudioverse/docs/branches/master/python/
https://github.com/ronnyandersson/zignal
https://github.com/crabl/HeadSpace
http://willdrevo.com/fingerprinting-and-audio-recognition-with-python/
https://github.com/Parisson/TimeSide/
http://files.parisson.com/timeside/doc/index.html
https://github.com/thomasfillon/Timeside-demos
https://github.com/pierre-rouanet/dtw
https://github.com/pierre-rouanet/aupyom
https://github.com/micknoise/Maximilian (C++)
https://github.com/endolith/waveform_analysis
https://gist.github.com/endolith/148112
http://mathworks.com/matlabcentral/fileexchange/69-octave
https://github.com/astorfi/speechpy
signal (C++11): https://github.com/ideoforms/signal, http://libsignal.io/
https://github.com/everdrone/libsnd (C++)
https://github.com/LancePutnam/Gamma (C++)
https://madmom.readthedocs.io/, https://github.com/CPJKU/madmom (Python audio and music signal processing library)
Automatic headphone equalization: https://github.com/jaakkopasanen/AutoEq
Introduction to Digital Filters (with Audio Applications): https://ccrma.stanford.edu/~jos/filters/
Jupyter Notebooks: https://github.com/khiner/notebooks/tree/master/introduction_to_digital_filters
C++ Library for Audio Analysis: http://www.adamstark.co.uk/project/gist/, https://github.com/adamstark/Gist
The Synthesis ToolKit in C++ (STK): https://ccrma.stanford.edu/software/stk/, https://github.com/thestk/stk
Fast, modern C++ DSP framework, FFT, Audio Sample Rate Conversion, FIR/IIR/Biquad Filters (SSE, AVX, ARM NEON): https://github.com/kfrlib/kfr (GPL-3.0)
A Collection of Useful C++ Classes for Digital Signal Processing: https://github.com/vinniefalco/DSPFilters
Phase Vocoder In Python: https://github.com/haoyu987/phasevocoder
Learning DSP Illustrated: https://dspillustrations.com/
https://rust.audio/articles/useful-resources/
PySDR: A Guide to SDR and DSP using Python: https://pysdr.org/
The Scientist and Engineer's Guide to Digital Signal Processing: http://www.dspguide.com/pdfbook.htm
Intuitive Guide to Convolution: https://betterexplained.com/articles/intuitive-convolution/
Q Audio DSP Library (C++): https://cycfi.github.io/q/, https://github.com/cycfi/q
https://github.com/olilarkin/awesome-musicdsp
https://github.com/c4dm/qm-dsp (C++)
A Hierarchical Approach for Audio Capture, Archive, and Distribution: https://www.aes.org/e-lib/browse.cfm?elib=20456
The Gentle Art of Dithering: https://www.aes.org/e-lib/browse.cfm?elib=20457
http://www.dsprelated.com/showarticle/164.php
http://www.dsprelated.com/showarticle/170.php
http://www.dsprelated.com/showarticle/194.php
http://www.dsprelated.com/showcode/270.php
http://scipy-cookbook.readthedocs.org/items/FIRFilter.html
https://www.youtube.com/watch?v=QVuU2YCwHjw
https://www.youtube.com/watch?v=qS4H6PEcCCA
https://mathematica.stackexchange.com/questions/171755/how-can-i-draw-a-homer-with-epicycloids
https://bl.ocks.org/jinroh/7524988
Drawing an elephant with four complex parameters: https://doi.org/10.1119/1.3254017
http://musicinformationretrieval.com/
https://github.com/stevetjoa/stanford-mir