Mercuriall Audio released Chorus WS-1, a free chorus pedal emulation VST, AU and AAX plugin.
Guitar stomp boxes, preamps and cabinet simulation VST/AU/AAX developed for fun and modeling research.
Experimental nonlinear cabinet simulation
Stomp boxes based on circuit simulation, using the method of solving nonlinear differential equations.
Preamps simulations, using different neural networks approaches
Plugins available for Mac and PC (some plugins only for 32-bit DAWs, some old plugins only in VST format; experimental plugins not planned to be updated)
More info here: Mercuriall Audio | Chorus WS-1