They say it better than I ever could,
AgileFant is an open source tool
for managing agile software
development activities, such as:
projects, products, releases,
iterations and backlogs. It brings
together the perspectives of long-term
product and release planning and
project portfolio management.
Another one that's recently sparked some interest and seems potentially useful (I'm in beta, easy to get in afaik) is Flowdock which is basically a mish-mash of email alerts, RSS feeds, ticketing systems and plain ol' realtime chat with status messages et al. Think of it as Google Wave that doesn't suck and check out the intro video from the front page.
