As far as I can tell, the Gecko licensing seems reasonable enough.
Starting here, on the Gecko layout engine page (where they don't specifically state the license terms as far as I can see)...
http://www.mozilla.org/newlayout/... and hitting "Get the Source"...
http://developer.mozilla.org/en/docs/Download_Mozilla_Source_Code... they state "This code is covered by the Netscape Public License and Mozilla Public License", which is linked here...
http://www.mozilla.org/MPL/... where they say "All of the code which makes up the core Mozilla products is licensed under a MPL/GPL/LGPL tri-license
or a licence compatible with all three of those (e.g. the BSD licence). Other code in our repository may have different licensing terms."
If you go for the BSD license, my understanding is that you can basically do what you like with the code as long as you provide the
boilerplate BSD license text along with your application. (Ahem... "I am not a lawyer.")
Windows HTMLView is rubbish aswell as it uses Internet Explorer
Bah, anti-M$ drivel. Works fine here, and on most of the Interweb!