From iA wiki
An open-source Free Software audio editor for Windows, Linux, and Macintosh. It supports WAV, AIFF, Ogg Vorbis, and MP3 digital audio formats as well as 24-bit and 32-bit sample formats. Can perform multi-track audio recording and integrates some VST plug-ins.
- Unofficial User Forum hosted by Nabble. It currently archives Audactiy mailing lists into a searchable forum. You can search for answers or post your questions there.