Clyp - Clyp is the easiest way to record, upload and share audio. No account required.
Music Speed Changer (Classic) - Music Speed Changer (Classic) is an amazing mobile app that enables you to adjust the pitch and tempo of your music to make it slower or faster through sound touch processor.
Audio Hijack - Record any audio, with Audio Hijack!
Adobe Premiere Pro - Edit video faster than ever before with the powerful, more connected Adobe Premiere® Pro CC.
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.