SCOP is a library for writing distributed applications. The functionality includes message-passing, events, and RPCs. It is primarily aimed at C++ programs on Linux, or Java anywhere. Much simpler than CORBA, it is easy to learn, general-purpose, fairly fast, thoroughly documented, complete, and free.
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Advantages for open source games
I found this article very interesting. Although it was full of useful information, I have to agree that it doesn't really answer the question it asks itself - and if it had done the conclusion would surely have been that open source games are not yet as good as commercial ones.
For any one game, a commercial software house is very likely to throw more resources at it than an open source project can. However I have come to a slightly different conclusion. It seems to me that the great advantage of open source games is that they can build on work which has been done before, whereas most commercial games have to start almost from scratch. The really interesting developments are the open source gaming libraries, such as SDL, and the free engines for 3D worlds and role playing games which are starting to emerge. By using these an open source game has a great head start.
Viewed in this light, although open source games currently can't compete with commercial ones, they might eventually surpass them. Imagine open source terrain generators, open source route finding and opponent AI algorithms, open source artwork (sprites and 3D models) and so on.