I am maintaining iDempiere Libero plugin and i am still figuring out a Kanban board integration for it and also coupling to the new Warehousing Management System.
You may read my forums to decide how maintainable it is.
http://red1.org/adempiere/ (i still using the name adempiere but it is all about idempiere now). It is still developmental and thus not recommended for production unless you are well prepared for it at your own risk.