Spotted in Torsten's Blog:

The OpenQwaq project is based on the commercial software that Teleplace has been delivering to the market over the past four years. It is a highly-secure, enterprise-class virtual collaboration platform that has been used by large commercial enterprises and federal agencies. The OpenQwaq project enables organizations - large and small, profit and not-for-profit - to implement virtual workspaces for their specific needs.

Licensed under GPL2, so you may need to look into whether you can make use of it in your context.

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