Praat 5.4.22

Application with which phoneticians can analyze, synthesize, and manipulate speech.
Praat is an application with which phoneticians can analyze, synthesize, and manipulate speech and create high-quality pictures for their doctoral theses and articles.

Here are some key features of "Praat":

Speech analysis:
spectral analysis (spectrograms)
pitch analysis
formant analysis
intensity analysis
jitter, shimmer, voice breaks
cochleagram
excitation pattern

Speech synthesis:
from pitch, formant, and intensity
articulatory synthesis

Listening experiments:
identification and discrimination tests
Labelling and segmentation:

label intervals and time points on multiple tiers
use phonetic alphabet
use sound files up to 2 gigabytes (3 hours)

Speech manipulation:
change pitch and duration contours
filtering

Learning algorithms:
feedforward neural networks
discrete and stochastic Optimality Theory

Statistics:
multidimensional scaling
principal component analysis
discriminant analysis

Graphics:
high quality for your articles and thesis
produce Encapsulated PostScript files
integrated mathematical and phonetic symbols

Programmability:
easy programmable scripting language
communicate with other programs
(the sendpraat source code)
create hypertext manuals with sound I/O

Portability:
machine-independent binary files
read and write many sound and other file types

Configurability:
grow or shrink menus
save prefs for fonts, views, sound devices.

http://www.fon.hum.uva.nl/praat/