AppleCore Designs

https://www.applecoredesigns.co.uk/objects

Custom GDL Objects

b-prisma

https://www.b-prisma.de/object-shop/index.php

German provider of various localised Objects.

CAD Swift

https://cadswift.com.au

Highly parametric ARCHICAD Objects

4D Library

http://4dlibrary.com.au/library/

Beyond the Box.

Francois Favier

http://favier.francois.free.fr/lgd/obgdl.html

French Collection of various library parts.

GDLfragments

http://www.gdlfragments.com

Development, implementation and support of libraries

Master Script

http://www.masterscript.nl

Ready made objects, inspired by the everyday practice of an architectural office.

openGDL.org

http://www.opengdl.org

German site to document and participate in GDL Object development.

Smart GDL

http://smartgdl.uw.hu

Plants and Road Objects.