The Blue Obelisk Exchange: a place that brings together users of Open Data, Open Source, and Open Standards users and developers. It is the place to ask about the use and development of Open Data, Open Source, and Open Standards: how to perform tasks and solve chemical problems with these, or if an ODOSOS tools is available for some task. Or even to ask if someone can provide such a tool. The questions do not require to be about Blue Obelisk solutions itself; they can be about any ODOSOS chemistry tool, service, or database.