Reaper 2.206 is a Audio Recorder product from cockos.com, get 5 Stars SoftSea Rating, REAPER is a strong but sensible Windows software for multitrack recording and editing of audio. REAPER provides a flexible but easy-to-use interface that is equally conformable to beginners and experts alike.

Uber-strong routing of audio--functions as an entire virtual studio with patchbays, enabling all sorts of effects not possible anywhere else!
FAST installation and execution, portable program that supports running from USB-key or other removable media
Integrated network FX processing (use spare machines for additional processing power)
Supports reading/writing most media formats on the fly, including WAV, AIFF, OGG, FLAC, Monkey's Audio (APE), WavPack, and more!
Great editing features (auto-crossfades, ripple editing, arbitrary item grouping)
Tons of built-in FX, user editable FX, support for third party plug-ins.

Portable - supports running from USB keys or other removable media
64 bit audio engine
Excellent low-latency performance
Stunning multiprocessor performance
Direct multi-track recording to many formats including WAV/BWF/W64, AIFF, WavPack, FLAC, OGG, and MIDI.
Extremely flexible routing
Supports a wide range of hardware (nearly any audio interface, outboard hardware, many control surfaces)
Support for VST, VSTi, DX, DXi effects
ReaPlugs: high quality 64 bit effect suite
Tightly coded - installer is just over 3MB The license of this audio & mp3 software is Freeware, you can free download and free use this Audio & MP3 software.