Mindquarry is powerful Open Source collaboration software that allows you to share files (docs, images, etc.) and tasks with others. It also includes Wiki like editing.

It’s pretty smart, you can work offline and sync your tasks again once you reconnect to the internet.

See this video for a demo of all the features:

Mindquarry is free for Windows, Linux, Mac OS X.

[Mindquarry]

[tags]collaboration software, collaborative software, knowledge management software, project collaboration software, project management software[/tags]