cl-protobufs
CL-PROTOBUFS is a library to use Google Protocol Buffers in Common Lisp, originally written by Scott McKay at ITA by Google.

Its rivals seem to be protobuf and s-protobuf. The library documentation is included in the sources in a ReST document cl-protobufs.rst. You can git clone git://common-lisp.net/projects/qitab/cl-protobufs.git (If you're a developer, use ssh://common-lisp.net/project/qitab/git/cl-protobufs.git). Or you can browse the git web interface at http://common-lisp.net/gitweb?p=projects/qitab/cl-protobufs.git

http://common-lisp.net/project/qitab/