Here are a few,,,
Bond Arms
Bond makes a nice product,,,
I don't own one but I have shot their "SnakeSlayer a few times,,,
Really hard cocking action and a really heavy trigger,,,
Kills at both ends I tell ya.
American Derringer
Supposedly some very high quality derringers from this place,,,
I have no first-hand experience at all,,,
But Lady Derringer is nice.
Cimarron Derringer
I had one of the .22/.22 Mag versions of this little gun,,,
Heavy hammer and trigger pull but manageable,,,
Even with the .22 Mag it was holdable,,,
Kick wasn't too bad.
I think it is inherent in the physics of the small size guns,,,
That the hammer pull and trigger pull is heavy,,,
It took two hands to cock the Bond,,,
One holding tight to the frame,,,
The other on the hammer.
Super concealability but not fast shooters,,,
I consider derringers to be true last-ditch weapons.
Hope this helps,,,
.