... I send out a list of most interesting libraries and apps in the "C++" section to about 1100 subscribers.
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Protocol Buffers - Google's data interchange format
Fast and Simple Object Serialization to Protocol Buffers
A copy of the google protocol buffers, with a branch for performance improvements for the Java implementation
Plugin module to protoc to support Erlang protocol buffers.
Generate C++ API client libraries from Protocol Buffers.
C++ protobuf cache used by carmen
Protocol Buffers implementation in C