For completeness, here again a link to the example used and explained in the first part of the tutorial.
Erik Möller contributed a very nice C++ example that shows renderer callbacks in action to draw a coloured glyph with a differently coloured outline. The source code can be found here.
Another example demonstrates how to use FreeType's
stand-alone B/W rasterizer, ftraster.c. You need files from FreeType
version 2.3.10 or newer.
Róbert Márki contributed a small Qt demonstration program (together with its qmake file) that shows both direct rendering with a callback and rendering with a buffer, yielding the same result. You need FreeType 2.4.3 or newer.
Here is some simple C++ code (contributed by Static
Jobs LLC) that uses
FT_Outline_Decompose
to convert a glyph outline to the SVG format. As an example, here is the
resulting file of the call
example5 LiberationSerif-Bold.ttf @
(you can find the Liberation font family here).