Something I call Event Stream Assistant. I found myself commonly having to code small utilities for message brokering management/assistance (over and over again)- for the simple things like: Flat File Processing, Flat n' Sort, Single State, Single State Merge, CnC (CLI for managing (SAS) ESP projects). Logic Engine (basic logical engine / schema interpreter) Pika (AMQP), MQTT wrappers, and Websocket Async services...

Some of these items are in production environments. I plan on releasing it open source (fully) once I get around to it. It's really useful.