Evidence of a widespread use is important part of becoming a mainstream framework and raising a potential user confidence. From that standpoint, POCO is not quite there yet, at least not "officially". We do get frequent hits from numerous commercial entities, but only a small subset is factually verified and listed to use POCO.
This is a call to POCO users for report on usage. If you are using POCO in a commercial, scientific, non-profit or any other environment worth mentioning and you are not prevented by a legal obstacle, please consider giving back to the community by letting us know about it.
The POCO Team