Cap'n Proto

Data is encoded identically to its in-memory representation, eliminating serialization/deserialization overhead and enabling high-speed communication, as highlighted in the key features.

Provides secure object references across network boundaries, enhancing security in distributed systems, as described in the GitHub description.

Benchmarks show significantly faster performance compared to Protocol Buffers, making it ideal for low-latency applications, as claimed in the README.

Offers backward and forward compatibility, allowing updates to message formats without breaking existing code, per the key features.