WannaAudio 1.1.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application lies within Audio & Video Tools, more precisely Editors & Converters. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The actual developer of this software for Mac is Tida Inc.
From the developer:
WannaAudio is a simple and powerful utility that can extract a lossless audio from a movie file.
Drop any video files to WannaAudio icon or window and the program will start extracting audio data automatically.
Supported video format: FLV (containing MP3, AAC, Linear PCM audio) and MP4 (containing AAC audio).
You may want to check out more software for Mac, such as Stomp, Xilisoft Video Converter Platinum or FlashVideo Converter, which might be related to WannaAudio.