HoRNet Harmonics is a wave shaper based on the Chebyshev polynomials. Its non-linear processing lets you adjust the level of harmonics added to the signal, warming it up in different ways.
The plugin provides 10 harmonics generators of which you can set the amplitude and phase, increasing or decreasing the impact of the harmonic on the input signal. The resulting sine wave equivalent shape is displayed on the right side of the GUI.
HoRNet Harmonics provides great flexibility and lets you create interesting distortion, tray for instance to remove the fundamental frequency (set the first slider to zero) and create a "broken record" sound, and the best of all, Harmonics is free.