Redmine.suse.de (as an inhouse tool) is very close to be a jump in replacement for Trello.com (the outhouse tool). Investigate into setting up a redmine-board so that it has exactly (and only) the features a Trello board has, Investigate into a redmine GUI plugin that would allow drag and drop as nicely as Trello does. redminetaskboard is a candidate for the gui.
This project is part of:
Hack Week 10
This project is one of its kind!