Comment Postfix (Score 2) 373
Fantasic example of code written in a procedural language (C) in an object-oriented way,with clear separation of responsibilities.
The framework that Wietse created to structure Postfix is, from my perspective, a thing of beauty. I don't doubt that this has been done elsewhere, but Postfix is the first real example that I came across of a somewhat-large application structured in a very clean and understandable way.
Well worth spending some time perusing the code.