KDE and Webkit history & what role and what they are doing on browser ?

Dear Experts,

I used javascript to extract my user-agent as follows

User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
and then I go some user-agent extration website to report the following information
in the code area.  After reading the website of
http://webaim.org/blog/user-agent-string-history/  about history of user-agent string,
now know more about user-agent.

My question is
Question-1:
KDE (http://www.kde.org/) is first company or org doing HTML layout compiler for browser,right ? Could you talk more about "(KHTML, like Gecko)"
Question-2:
Webkit (http://www.webkit.org/), what they are doing for browser, could you talk more
about AppleWebKit/537.36. And we always use  css such as background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #6495ed), color-stop(100%, #ffffff));
Is that constructed by such Webkit org or company, right ?

Please advise

Duncan

Mozilla/5.0	They claim that it is based on Mozilla user agent (only true for Gecko browsers). It is now used only for historical reasons.
Windows NT 6.1	OS signature
WOW64	Windows running on a 64-bit processor signature
AppleWebKit/537.36	Open source application framework ver. 537.36
(KHTML, like Gecko)	HTML layout engine developed by the KDE project
Chrome/31.0.1650.63	browser signature
Safari/537.36	browser signature

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