Following the termination of the GMF Tooling project, the update site that used to reside on http://download.eclipse.org/modeling/gmp/gmf-tooling/updates/releases has disappeared.
This repository hosts a copy of the version of the GMF Tooling update site, extracted from the updates/releases folder of the project's tarball so that tools that depend on GMF Tooling (e.g. Eugenia) can still be installed without needing to download/extract the entire tarball.
To install GMF Tooling from this update site, please point Eclipse (Help -> Install New Software) to:
https://github.com/epsilonlabs/gmf-tooling/raw/main/