Praat

Praat (64-bit)
FreePraat: Powerful Speech Analysis for Phonetics Research
Windows
Praat
FreeAnalyze, synthesize, and manipulate speech.
Windows
Praat for Linux (64-bit)
FreeComprehensive Analysis Tool for Speech and Language
Linux
Praat for Linux
FreeComprehensive Language Analysis with Praat for Linux
Linux
Praatcon Portable (32-bit)
FreePraatcon: Advanced Speech Analysis for Experts
Windows
Praatcon Portable (64-bit)
FreePraatcon: Scriptable Phonetic Speech Analysis
Windows