
Insert Piz has released Mr. Alias 2, its new free virtual synth which is now open source and cross-platform.
Mr. Alias 2 uses non-bandlimited oscillators which can be transposed near to and beyond the Nyquist frequency, causing most of their spectra to be aliased back into audible non-harmonic frequencies. The sound can then be further processed by a number of crude "effects." 
Though it is based on the same concept as the original, Mr. Alias 2 is completely rewritten for cross-platform compatibility, and has a number of significant improvements. 
Some highlights : 
- 2 oscillators. 
- 18 waveforms. 
- Full stereo processing. 
- 6 filter types including a formant filter. 
- Filter envelope. 
- External audio processing. 
- Patch randomizer button. 
- Highly configurable MIDI control with MIDI learn. 
- MIDI-controllable patch morphing. 
- Drag & drop preset and MIDI map loading. 
- Resizable GUI.
Mr. Alias 2 is available now for free as a VSTi for both Windows and Mac OS X, an AU version is also available for Mac users.