GRAPHISOFT have released the GDL Object Adapter for AutoCAD 2012. The plugin can be downloaded from our official website.
Also review GRAPHISOFT's cloud based object solution, BIMcomponents.com
BIM Components Concept
This cloud-based ArchiCAD-integrated community database collects and provides direct access to tens of thousands of GDL elements in one place. The easily searchable collection continually grows with users', GDL developers' and manufacturers' new elements. BIMcomponents.com helps you obtain trustworthy 3D or 2D elements in the form of parametric GDL objects by bringing the elements directly into your ArchiCAD project library with easy embed and drag & drop methods. Seek community opinion and share your custom objects with a click, widening the available selection. Built-in quality filters, user evaluations, and recommendations result in a high overall object quality.
Download ArchiCAD for free: