Juno Ju-X has updated its free Hosting AU to version 1.5.0.
Hosting AU is a micro-sized digital audio player for Mac OS X that hosts Audio Unit instrument and effect plug-ins. It comes with 4ch+1 mixer with external audio input, 32-bit recorder, and a music-typing feature called "LazyKey".
Now it hosts new AUv3: Audio Unit v3 plugins along with Audio Unit v2 plugins as well as past versions.
Price: Free.