Looking for good open source, web-based project management system?

I am looking for a good open source project management software. key is that they system is web-based, can by run behind a firewall. Does not need to be particularly powerful (e.g., resource leveling is optional), but would like something that is proven, popular, and has an active developer base (so that bugs get fixed, etc.)

I have looked at Dotproject (http://www.dotproject.net/) and Double Choco Latte (http://dcl.sourceforge.net/). Any experience with those systems?

I don’t have experience with either of the tools you mention, but I’ve included a link to a list of open source PM tools.

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