Is there any electron like framework which uses the native webview libraries (webkit etc) instead of shipping their whole browser for each application?
There is a WebKit based HTML renderer called Ultralight. It works by creating hooks and intercepting the rendering calls of WebKit in order to allow embedding it easily.
Unfortunately the license of Ultralight is questionable, and it's not open-source either by bypassing the WebKit license (which is very questionable as well since WebKit itself is BSD-licensed).
Having such a project as a free open-source variant would be a huge game changer in my opinion.