libRocket (http://librocket.com) is a renderer agnostic XHTML/CSS renderer, useful for creating UIs for games and the like. Hopefully makes assembling a game UI a breeze.
Advantages of v8rocket:
Renderer agnostic, input agnostic, allows a fully dynamic layout, that can grow/shrink etc. as needed, uses existing layout technology - standardized XHTML/CSS to describe layout, allows easy "theming" via CSS, or even changing the XHTML, without having to recompile, allows delegation of UI work to developers skilled in web programming.
These details are provided for information only. No information here is legal advice and should not be used as such.