Boker makes a knife they call, I think, the Bokermatic, blade slides out the front by action of your thumb, no springs attached. Stays open by virtue of a pivoting scale on the handle. Blade is somewhat loose when open, a sort of light (key word) duty utility pocketknife, nothing jazzy in the least. Remember the old-tyme Christie front-opening gent's pocket knife that your uncle had? They still have a website, or at least did last time I looked. Classy little thing.