If you're looking for the most lightweight browser based on a modern web engine, this is it. Since it's based on webkit, it provides support for modern web technologies such as JavaScript, SVG, AJAX, etc.

Includes the WKCCC shared library for embedding WebKit. You can create your own front ends for WKCCC using any screen library you prefer (FLTK, SDL, etc.) or use it with command line applications. You can also convert web pages to graphics with it. WKCCC includes a command line version of JavaScript that can be used for cross-platform scripting or other purposes.

Operating system: Windows, Linux, Mac OSX, Unix, BSD
Screen library: FLTK (Netrider), any optional screen library (for wkccc)
Requirements: Python (if building from source only)