... 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
Protocol Buffers implementation in C
Fast and complete Perl protobuf implementation using uPB and Google .proto parser
Minimalist protocol buffer decoder and encoder in C++
Some Compression streams (gzip, snappy, lz4) implementing the ZeroCopy Interface from Google(TM) protobuf 2.4.1