As you indicate the best one can do for an open source distribution is provide a rough guess of implementations, of which some percentage are in production use. If I were to make a guess, I would say there are around a hundred implementations in pilot or production at present. (By pilot, I mean an architecture that is complete, but isn't fully rolled out to production use.) The number is based on the anecdotal information we've heard through Apache, the open.iona.com community, and customers for whom we're providing services and support today.
I can give you an idea of ten organizations running ServiceMix / FUSE ESB in production today.
In the United States:
- a Fortune 500 retailer
- a government research institute
- a leading provider of insurance services
- a provider of telecommunications software and services
- a leading specialty online retailer
- a restaurant chain with over $300m in revenues
- a leading systems integrator
- a leading financial services and fund management firm
- multinational firm providing services and software for commodity trading
- a government agency providing services to more than one million citizens
I know of quite a few others using ServiceMix in production, as well as several software, hardware and SaaS products that are sold today that incorporate ServiceMix or the FUSE ESB. (As you know the Apache license permits modification and redistribution as long as the attribution remains in the source code.)
In the coming months, we at IONA plan to make more detailed and official announcements of some organizations that are using FUSE ESB in production and are IONA customers.