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| GNU Octave | Maths package | http://www.octave.org/ |
| libsndfile | Lib for read/writing audio files | http://www.zip.com.au/~erikd/libsndfile/ |
| LADSPA | Audio App plugin standard | http://www.ladspa.org/ |
| Audacity | http://audacity.sourceforge.net/ |
| Snd | http://www-ccrma.stanford.edu/software/snd/ |
| Sweep | http://sweep.sourceforge.net/ |
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