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The ADG library (Automatic Drawing Generation) is a set of functions focused on automating the drawing of mechanical parts.
It is not a CAD system but a library providing a non-interactive canvas where a custom application can put common CAD entities such as paths, hatches and dimensions, to automatically create technical drawings.

When different parts share a similar shape, a custom application can be much more effective than the traditional way of manually drawing every part with a CAD. In some production factories, such as the automotive sector, this is quite common. Nozzles, elements, nuts, valves, needles and a lot of other parts fall into this category.

You can reach similar targets by using parametric CADs, but a custom application provides the following benefits:
more customizable
if you have to create an application from the ground, you can do whatever you want;
not so bloated as a parametric CAD
this honestly depends on your application but, talking in general, ADG doesn't have a lot of stuff a CAD system must have (such as an interactive user interface);
can be easily connected to a database
the model-view separation greatly improves the connectivity of the application;
the drawings can be generated on the fly
the canvas does not enforce user interaction: this feature can be used in a dynamic site or in a web-based application by automatically generate the drawing only when the page is accessed, giving an always up to date website.
Although this ADG is developed in C using an object-oriented approach, the applications based on it are expected to be developed using higher-level languages: check out the technical details for further information.