Audacity® is free, open source, cross-platform software for recording and editing sounds.
====== Microphone Pro ======
From: http://apps.microsoft.com/windows/en-us/app/microphone-pro/3b9b142b-f5cf-4799-bbdf-87f926db0c37
Microphone Pro is a sound recorder with ability to record, playback, save, and upload to OneDrive. Features a very simple yet powerful interface.
Microphone Pro is now optimized for Windows 8.1.