Hi Adrien: Is this what you are referring to? http://www.j-bus.org/ j-bus, what's that? j-bus is a light-weight, fully-functional, ESB (Enterprise Service Bus) implementation which provides the bare essentials for HTTP-based software system interoperability. Though limited in terms of protocol support (HTTP), it is relatively powerful in terms of operational control, `tweakability`, and queue management. It is also 100% open source. It is free for anyone to use - see the legal section for more info. This said, I do not fancy the term 'Enterprise' in describing this software, but rather prefer the more simple 'Service Bus' or 'Bus' denomination. I find this to be more fair in view of the single-protocol support that j-bus offers (HTTP, for now). I lean more towards the more simple 'Bus' description, insofar that j-bus is simple software-based analogy of the bus networking topology.