Not-forking avoids duplicating the source code of one project within another project, where the projects are external to each other. It avoids project-level forking by largely automating change management in ways that version control systems such as Fossil, Git, or GitHub cannot.
Project README: https://lumosql.org/src/not-forking/ Detailed technical spec: https://lumosql.org/src/not-forking/doc/trunk/doc/not-forkin... Example of project using Not-Forking: https://lumosql.org/src/lumosql/doc/trunk/doc/lumo-build-ben...