Audacity is free, open source, cross-platform audio software for multi-track recording and editing.
Audacity can record live audio through a microphone or mixer, or digitize recordings from other media. With some sound cards, and on any recent version of Windows, Audacity can also capture streaming audio.
Device Toolbar manages multiple recording and playback devices.
Level meters can monitor volume levels before, during and after recording. Clipping can be displayed in the waveform or in a label track.
Record from microphone, line input, USB/Firewire devices and others.
Record computer playback on Windows Vista and later by choosing “Windows WASAPI” host in Device Toolbar then a “loopback” input.
Timer Record and Sound Activated Recording features.
Dub over existing tracks to create multi-track recordings.
Record at very low latencies on supported devices on Linux by using Audacity with JACK.
Record at sample rates up to 192,000 Hz (subject to appropriate hardware and host selection). Up to 384,000 Hz is supported for appropriate high-resolution devices on Windows (using WASAPI), Mac OS X, and Linux.
Record at 24-bit depth on Windows (using Windows WASAPI or Windows DirectSound host), Mac OS X or Linux (using ALSA or JACK host).
Record multiple channels at once (subject to appropriate hardware).
Easy editing with Cut, Copy, Paste and Delete.
Find the spot to edit easily with scrubbing and seeking or Timeline Quick-Play.
Unlimited sequential Undo (and Redo) in the session to go back any number of steps. Edit and mix large numbers of tracks.