Command-line tool for sending and receiving ZeroMQ messages on any socket type (REQ/REP, PUB/SUB, PUSH/PULL, DEALER/ROUTER, and all draft types). Supports Ruby eval (-e/-E), script handlers (-r), pipe virtual socket with Ractor parallelism, multiple formats (ASCII, JSON Lines, msgpack, Marshal), Zstd/LZ4 compression, and CURVE encryption. Like nngcat from libnng, but with Ruby superpowers.

Adds lz4+tcp:// endpoint support to OMQ with per-part LZ4 block-format compression, bounded decompression, and in-band dictionary shipping. Complementary to omq-zstd: worse ratio, far faster encode, far smaller per-connection footprint.

Bridge OMQ sockets into Ruby Ractors for true parallel processing

Adds zstd+tcp:// endpoint support to OMQ with per-frame Zstd compression, bounded decompression, in-band dictionary shipping, and sender-side dictionary training.