Overdrive and fuzz combo pedals

[P-oddz]

I built a clone of the Emanating Fist Black Acid and really dig it.
It's not a dual switch so you can't stack tones, but it has a separate Drive and Fuzz knob that blend into one signal.

Demo (mostly guitar-centric but they do include bass):

 

[jazznrick]

The D*A*M Ezekiel does both well.