Discuss on Groups View on GitHub Get Email Updates Follow on Twitter News kentonv on 17 Jun 2014 Update Jun 18, 2014: I have made some corrections since the original version of this post. Update Dec 15, 2014: Updated to reflect that Cap’n Proto 0.5 now supports Visual Studio and that Java is now well-supported. Yesterday, some engineers at Google released FlatBuffers , a new serialization protocol and library with similar design principles to Cap’n Proto. Also, a few months back, Real Logic released Simple Binary Encoding , another protocol and library of this nature. It seems we now have some friendly rivalry. :) It’s great to see that the concept of mmap() -able, zero-copy serialization formats are catching on, and it’s wonderful that all are open source under liberal licenses. But as a user, you might be left wondering how all these systems compare. You ha...