I had blogged about the POCO Project some years ago, either on this blog, or my earlier blog, jugad's Journal.
The POCO Project is a set of C++ libraries for doing common things that many applications need to do. Though I got to know about it indirectly via searching for PDF libraries (it had a thin wrapper over libharu, a C PDF creation library), that is not the main thing about it. It has lots more generally useful functionality, of which some are: Compression, Database, Filesystem, Logging, Multithreading, Processes, and XML.
Happened to see a tweet about it today, about a talk they are having. Then checked the project site again and found that it now has lots of users, many contributors, and has got a couple of corporate sponsors. (When I first came across it, I don't think they had any sponsors). There are also some testimonials from users, on their site.
POCO project users (from their site):
[ Companies like 454 Life Sciences, Appcelerator, CACE Technologies, CodeLathe, Schneider Electric and Voltwerk Electronics; open source projects like GLUEscript, MITK, openFrameworks, Open Game Engine and Ogre. ]
POCO project contributors.
- Vasudev Ram - Dancing Bison Enterprises