In 2015 the repository moved here when Google retired their code hosting site.
The old version is again maintained at github.com/beanshell. There is some ongoing effort to integrate the changes and improvements made to the project there.
See releases page for more information.
For contributing: Please post your pull requests against branch v2.1. There is an ongoing effort to change the licence to Apache License, version 2.0 (see also issue #110), so all contributions will be dual licenced.