Audacity is a free and open-source digital audio editor and recording application software, available for Windows, macOS/OS X and Unix-like operating systems. Audacity was started in the fall of 1999 by Dominic Mazzoni and Roger Dannenberg at Carnegie Mellon University and was released on May 28, 2000 as version 0.8.
As of August 14, 2019, it is the most popular download from FossHub, with over 76 million downloads since March 2015. Previously, downloads were served from Google Code and SourceForge, with a combined total in excess of 100 million downloads. Audacity won the SourceForge 2007 and 2009 Community Choice Award for Best Project for Multimedia.
In addition to recording audio from multiple sources, Audacity can be used for post-processing of all types of audio, including podcasts by adding effects such as normalization, trimming, and fading in and out. Audacity has also been used to record and mix entire albums, such as by Tune-Yards. It is also currently used in the UK OCR National Level 2 ICT course for the sound creation unit