No, WebKit is an engine. It ships with small demo browsers for some platforms (minibrowser for gtk, at least) but that's it.
You might be confused by Apple calling its nightly Safari builds "WebKit technical preview" or whatever. It (used to) show up as "WebKit.app", but it's literally Apple Safari.
"Safari" is a proprietary browser that uses WebKit, which is open source. Safari Technology Preview (purple Safari) and WebKit.app (black Safari) are just Safari, but with the WebKit swapped out through various methods. Oh, and MiniBrowser works on macOS as well.
You seemed to conflate Safari Technology Preview with the WebKit nightlies, when they are in fact different things and structured differently and used for different things (the former acts much more like a "standalone Safari" than does the latter, which is essentially just the WebKit frameworks loaded in to your existing Safari).
> You might be confused by Apple calling its nightly Safari builds "WebKit technical preview" or whatever. It (used to) show up as "WebKit.app", but it's literally Apple Safari.
I think Chromium is to Chrome as Webkit is to Safari. The latter have proprietary code on top of the open-source former.