Audacity is free, open source software for recording and editing sounds. You can use Audacity to record live audio, convert tapes and records, edit sound files, change the speed or pitch of a recording and much more.
Adobe Audition is an audio editing and post-production suite.
DarkAudacity is a build/fork of the the well known free sound editor, Audacity, customized with a darker, more modern theme - and a few small tweaks. The audio engine underneath is the same audio engine. The same code powers it. Like Audacity, it is completely free.Discontinued
The project seems no longer developed since 2019. Last version, 2.3.2, released in May 2019, can be still downloaded from FossHub. The GitHub page shows an older version (2.1.3) that dates back to 2016.
Audacium is an easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. Developed by a group of volunteers as open source.
AudioMass lets you record, or use your existing audio tracks, and modify them by trimming, cutting, pasting or applying a plethora of effects, from compression and paragraphic equalizers to reverb, delay and distortion fx.
Similarity is a useful program that helps you to find and remove similar, duplicate musical files (MP3, WMA, OGG, ASF, WAV, FLAC, APE, WV) with the same or similar sound content, music tags (ID3,WMF,Vorbis).
Lossless Audio Checker is a utility to check whether a FLAC or WAVE file is truly lossless or not, by detecting cutoff frequencies. It can show you the full frequency range for each file.
Sneedacity (named after Sneed's Feed and Seed from The Simpsons episode, "E-I-E-I-D'oh") is a free (libre), open source, and privacy-respecting audio recording and editing suite forked from Audacity.
Audiochecker is a tiny and portable tool which analyzes the source of WAV, LPAC, SHN, APE and FLAC audio formats, in order to verify if the encoding is lossless. If not, it means that the files in question are converted from other formats with lower quality, such as MP3.
The project is no longer developed. Last version, 2.0 Build 457 Beta, released in June 2006, can be still downloaded from Softpedia.com