Audacity: Downloadable open-source software for recording, conversion, editing, and exporting audio files through a simple and user-friendly interface. FREE.
Audio
GarageBand
GarageBand: a digital music creation studio featuring a sound library that includes software instruments, digital amps and stompboxes, and sound effects. Useful for creating, recording, mixing, and sharing audio files. Available on Mac and iOS, integrated with iCloud. PAID (built-in most Mac computers).
Soundcloud
Soundcloud: this online audio distribution platform enables users to record, upload, and share audio files. Users can annotate audio files by inserting comments along the audio track. Mobile app available. 30 Days FREE Trial.