Collocated: A wall, some blue tape, sticky notes, index cards, and flip chart paper. Distributed: Pivotal Tracker, IM, and "it depends" depending on what you m

Collocated: A wall, some blue tape, sticky notes, index cards, and flip chart paper. Distributed: Pivotal Tracker, IM, and "it depends" depending on what you mean by collaborative. Could be Google docs.