http://www.voxengo.com/product/elephant/ $149.95, introductory $99.95, upgrade $49.95
Elephant features:
* Transparent signal limiting action
* 9 predefined limiter modes
* Limiter mode editor
* Optional release stage
* Noise-shaped bit-depth converter
* DC offset removal filter
* Waveform graph view
* Stereo and multi-channel processing
* Internal channel routing
* Channel grouping
* Up to 8x linear-phase oversampling
* 64-bit floating point processing
* Preset manager
* Undo/redo history
* A/B comparisons
* Contextual hint messages
* All sample rates support
* 22 ms compensated processing latency
Elephant 4.0, which is backwards-compatible, includes the following
changes since version 3:
* Added a new "EL-4" limiter mode, with less harmonic coloration.
* Added a new "Dynamic Release Control" limiter stage.
* Added a new "Timing" limiter mode parameter.
* Added a new "Release to Attack Ratio" limiter mode parameter.
* Added a new "Release Shape" limiter mode parameter.
* Added input level meter together with the threshold mark.
* Implemented the "Eval" limiter's evaluation mode.
* Added the "Trans View" transient visualization.
* Made the "In Gain" and "Out Gain" knob ranges more practical.
* Magnified the "Out Gain" knob's scale around 0 dB.
* Made changes to the "Trans Time" parameter stutter-free.
* The output statistics are now automatically reset if any parameter
that influences the output statistics was changed.
* Added "EL-4", "COMPACT" and "EXPANDED" factory limiter modes.