DimDim is a free web meeting application that you can install on your own server to have as many users as possible. Might be a good solution to Dojos.

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gusaus’s picture

gusaus commented
Status: Active » Closed (duplicate)

DimDim definitely looks promising. Marking this issue as duplicate since it's one of the solutions we're evaluating over here - http://drupal.org/node/203815