I've created two GIL extensions.
1) A light Freetype wrapper for displaying text.
2) An implementation of the WU Line algorithm for rendering alialiased lines.

Both are designed to maximally STL friendly for modern "generic" programming techniques.

Required Downloads.
1) freegil.hpp, utilgil.hpp and utilstl.hpp
2) Adobe GIL
3) boost
4) Freetype

Samples
Text rendering with "render_gray_glyph" (long version)
Text rendering with "render_gray_glyph" (short version)
Antialiased lines rendering with "draw_line"

Other GIL Samples
Embedding an image with "boost::gil::rgb8c_planar_view_t".
Copying an image with "copy_pixels"
Red line border
Rounded Corners