Hyper-G (known as HyperWave in its commercial version) was an OpenHypertext system inspired by early developments of the Web.
Users could create bi-directional links between arbitrary documents and collections.
Although Hyper-G offered a full interface to the 'underlying' Web, the advanced functionality of the system could only be accessed through the Hyper-G clients, which failed to achieve widespread acceptance.
The DistributedLinkService, Webvise, and Chimera efforts are also HypermediaForTheWeb systems.
Keith Andrews, Frank Kappe and Hermann Maurer, The Journal of Universal Computer Science 1(4), pages 206-220, April 1995.
Keith Andrews, Frank Kappe and Hermann Maurer, Computer Networks and ISDN Systems 27(6), pages 919-926, 1995.