The ActiveCollab project has gone closed source,
so the community took the last open source version and started a new project to take it forward:
This is pretty common in the open source world.
The creators of a project decide they want to close the source and go the proprietary route, and the community takes up the open code and continues on.
it’s called GraceNote now,
and like open source projects going closed, a free replacement sprang up: