Open Source Audio Analysis Software

Audacity is a free, easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. Audacity is free software, developed by a group of volunteers and distributed under the GNU General Public License (GPL). Programs like Audacity are also called open source software, because their source code is available for anyone to study or use. There are thousands of other free and open source programs, including the Firefox web browser, the LibreOffice or Apache OpenOffice office suites and entire Linux-based operating systems such as Ubuntu

MediaInfo is a convenient unified display of the most relevant technical and tag data for video and audio files.

Kwave is a sound editor for the KDE environment. It is written with KDE/QT and is extendable through a powerful plugin interface. For the moment it supports .wav files and many other formats, recording/playback via PulseAudio, Qt Multimedia, OSS and ALSA and some simple effects

QtGain is a simply frontend for MP3Gain, VorbisGain, AACGain and Metaflac which analyses and adjusts your media files so that they have the same volume without the need to reencode the files. With QtGain you can simplify this job to replay gain your media files. Simply add your files or folders via drag & drop or select a folder with a file dialog. QtGain starts gaining immediately after adding some files and of course you can add more files while QtGain works on your files. Files which are already gained and need no recalculating are automatically skipped. Files which cannot processed are automatically listed in a dialog box at the end of the job.

FFT Spectra is a tool for visualization of frequency spectra of an audio signal. What is it good for? For instance, you can verify whether you are able to sing and whistle in-tune or tune your guitar.

This application allows you to test audio devices using your computer's sound card. A stereo line-level audio input is required, and support for sampling rates of 192 kHz or higher is desirable. The impulse tester is designed to study changes that occur in a non-periodic signal when passing through the electronic device being tested. Testing is performed by generating a single pulse, recording the original pulse shape on one channel, recording the modified pulse shape on another channel, and then comparing the shapes of the original and tested signals.