KMS Drums is free.
Download EFM Axx2 here!
Download EFM SCP5 here!
PhaseBender by Bibasoft is a small poly-synth with only one morphing osc based on twoauto-sync phase shapes and three waveforms that can be redrawed with the mouse.
It can be modulated with a 16 step sequencer. An unison mode, a tremolo and a vibrato improve the sound that is by far not the best, with aliasing, but i like the principle and this dirty and granulous sound.
Download PhaseBender here!
Kamioooka is a free polyphonic Full-Modular synthesizer with patch cable system. You can freely combine modules and make patches. 10 module slots and 7 types of modules (VCO/VCF/VCA/ADSR/LFO/MISC/SEQ) are available.