Clean preamp pedals?

[Grubb]

What are some good clean preamp or amp-in-a-box pedals? I know about the Integral Preamp, are there any others?

 

[WheatAndBarley]

Son of Ben (Benson Preamp) is definitely this.

 

[Danbieranowski]

What are some good clean preamp or amp-in-a-box pedals? I know about the Integral Preamp, are there any others?

I just built that Phoenix Ultra Overdrive which cleans up quite a lot.