iZotope RX is the most complete audio restoration product on the market, a unique standalone application designed from the ground up to combat a range of audio problems. In addition to unique workflow features designed to help you get the best results, RXs powerful tools can do processing that plug-in based restoration products simply cannot do. This paired with completely new processing technology results in cleaner, more natural sounding noise reduction and audio repair.
RX Advanced Features:

+ iZotope MBIT+ dithering panel with full control over dithering options
+ iZotope 64-bit SRC resampling panel with a full range of control
+ Advanced manual declicking
+ Multi-resolution declipping
+ Multi-resolution spectral repair modes
+ Advanced denoiser parameters