ArchiRADAR - Resource site for ArchiCAD users, with GDL objects, and a mailing list. [more information in Italian language]
arkiKlub - A resource site for ArchiCAD users, including tutorials, tips and tricks, downloads, online support, and discussion forums for registered members.
GDL Alliance - An independent, international professional association consisting of GDL authors, software developers, and building product manufacturers.
Graphisoft R&D Zrt. - The developers of ArchiCAD, a 3D architectural design software with 2D drawing and layout functions for architects, interior designers and structural engineers.
