Serializer Speed Test
Performance benchmark tool of serialization libraries written in C++.
MessagePack is an extremely efficient object serialization library. It's like JSON, but very fast and small.
Protocol Buffers are a way of encoding structured data in an efficient yet extensible format. Google uses Protocol Buffers for almost all of its internal RPC protocols and file formats.
Yet Another JSON Library. YAJL is a small event-driven (SAX-style) JSON parser written in ANSI C, and a small validating JSON generator.