PRAAT
Praat (/prɑːt/; Dutch: [praːt], "talk") is a free computer software package for speech analysis in phonetics.[4] It was designed, and continues to be developed, by Paul Boersma and David Weenink of the University of Amsterdam. (Source: Wikipedia)
ELAN
It is computer software, a professional tool to manually and semi-automatically annotate and transcribe audio or video recordings. It has a tier-based data model that supports multi-level, multi-participant annotation of time-based media. It is applied in humanities and social sciences research (language documentation, sign language and gesture research) for the purpose of documentation and of qualitative and quantitative analysis. It is distributed as free and open source software under the GNU General Public License, version 3. (Source: Wikipedia)
PsychoPy
It is an open source software package written in the Python programming language primarily for use in neuroscience and experimental psychology research. Developed initially as a Python library and then as an application with a graphical interface, it now also supports JavaScript outputs to run studies online and on mobile devices. Unlike most packages, it provides users with a choice of interface - they can generate experiments by writing Python scripts, use a graphical interface that will generate a script for them, or combine both methods. Its platform independence is achieved through use of the wxPython widget library for the application and OpenGL for graphics calls. It is also capable of generating and delivering auditory stimuli.
AntConc
A freeware corpus analysis toolkit for concordancing and text analysis.
FieldWorks
FieldWorks consists of software tools that help you manage linguistic and cultural data.