This post collects software around speech processing that I would recommend from personal experience.
- Praat obviously the greatest software to do phonetics with a computer
- Wavesurfer Built on the ashes for former esps (Xwaves) code, great software to analyse/annotate speech
- Audacity "the" wave editor
- sox "swiss army knife of sound conversion"
- Sonic visualizer meant mainly for music
blog around speech technology