ArchiCAD Webring: A list of ArchiCAD related sites.ArchiRADAR: Resource site for ArchiCAD users, with GDL objects, and a mailing list [more information in italian language].Arexline: Developers of third party ArchiCAD Add-Ons and GDL Objects.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 Software Development Rt.: The developers of the architectural CAD software ArchiCAD and the facility management system ArchiFM.Integrated CADD Services: Provides ArchiCAD based solutions for architects.