gunnar-forge
Lists a user's repositories on GitHub, Codeberg/Forgejo and GitLab over the forge REST API, normalised to one Repo shape, so a picker can offer them for mirroring.
Part of Gunnar, a git server and git client. Source: https://www.gunnar.rs/repo/gunnar/gunnar.
License: AGPL-3.0-only, or a commercial licence granted jointly by Ignalina ApS and Vetra Automation AB (gunnar@gunnar.rs).