The Filter 2.4.5 for Mac is free to download from our application library. The application lies within System Tools, more precisely File Managers. The actual developer of this free Mac application is exabre.com.
From the developer:
The Filter is a neat, free piece of software that helps you build fantastic playlists from the music stored on your Mac. It's like a musical assistant who knows exactly which songs will fit together and which songs won't.
To build a playlist you open up iTunes and let The Filter analyse your library. You then click on 'Create a Playlist' to generate one based on your choice of artist or song.
You may want to check out more software for Mac, such as Filter Forge, Filter Forge Freepack 3 - Frames or Filter Forge Freepack 1 - Metals, which might be related to The Filter.