FireBird 2 is now being offered for free by Tone2 the German company based in Munich.
FireBird is not just a subtractive synthesizer but also uses Harmonic Content Morphing synthesis (HCM) which lets you load waveforms from a library and transpose it to bring out different harmonics. The release also contains 70 additional sounds.
Features
Very easy to program and easy to use
A unique sounding synthesis: Harmonic content morphing (HCM)
High sound quality: Warm, transparent
437 hand picked presets included, over 1000 sounds available
84 oscillator types containing 18,000 morphable waveforms
38 different filter types
True stereo mode, 4x unison mode, and up to 8 oscillators per voice
Can sound like other synthesis methods - additive, subtractive, AM, FM, phase distortion, supersaw, vocoder, sync
Can sound like natural instruments like piano, brass, organs...
23 spectral manipulations or “modifiers” can be applied to the oscillators
21 arpeggiator types
13 effect typesSkinable user interface
You can download from Tone2 here:
https://tone2.com/html/firebird%20vsti%20vst%20synthesizer%20plugin.html