ArchiCAD Webring
   A list of ArchiCAD related sites.
   http://x.webring.com/hub?ring=archicad

ArchiRADAR
   Resource site for ArchiCAD users, with GDL objects, and a mailing list [more information in italian language].
   http://www.archiradar.com/

GDL Alliance
   An independent, international professional association consisting of GDL authors, software developers, and building product manufacturers.
   http://gdlalliance.com/

Graphisoft R&D Software Development Rt.
   The developers of the architectural CAD software ArchiCAD and the facility management system ArchiFM.
   http://www.graphisoft.com/

Integrated CADD Services
   Provides ArchiCAD based solutions for architects.
   http://www.intcad.com/

arkiKlub
   A resource site for ArchiCAD users, including tutorials, tips and tricks, downloads, online support, and discussion forums for registered members.
   http://www.arkiklub.com/