Randomness is sometimes underrated by people in just coming into the world of synthesis, but it is extremely important to make stuff interesting it really adds a little spice to synthesis...
Sapel is a dual tamed random source from Frap Tools.
More info at Frap Tools
Pittsburgh Modular's latest release
Part 1 on cloned synths, will they surpass the originals?
Sega sound for now
Uses a unique ball and spring model