There are many alternatives to Sound Forge for Mac if you are looking for a replacement. The best Mac alternative is Audacity, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Sound Forge and many of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Sound Forge are FL Studio (Paid), Ocenaudio (Free), Adobe Audition (Paid) and Logic Pro (Paid).
"The free and open source audio editor" is an easy-to-use, multi-track audio editor and recorder for Windows, macOS, GNU/Linux and other operating systems. It is a fork of Audacity that respects your privacy and the GNU License.