Binary Serialization
C library/compiler for the Cap'n Proto serialization/RPC protocol
An implementation of the MessagePack serialization format in C / msgpack.org[C]
High-level C binding for ØMQ
C++ wrapper for czmq. Aims to be minimal, simple and consistent.
FlatBuffers Compiler and Library in C for C
Minimalistic C client for Redis >= 1.2
ZeroMQ core engine in C++, implements ZMTP/3.1
The ZeroMQ Enterprise Messaging Broker
MPack - A C encoder/decoder for the MessagePack serialization format / msgpack.org[C]
Google Protocol Buffers tools (C code generator).
Protocol Buffers implementation in C
Apache Thrift
tpl - a small binary serialization library for C