Fluent Bit is a Fast and Lightweight Log Processor, Stream Processor and Forwarder for Linux, BSD, OSX and Windows. It's part of the Fluentd Ecosystem and a CNCF (Cloud Native Computing Foundation) graduated project.
RSigma is a Rust detection-engineering toolkit for the Sigma standard. Its MCP server (rsigma mcp serve) exposes the toolchain to AI agents over stdio or Streamable HTTP, with tools to author, lint, validate, and convert Sigma rules, evaluate and explain detections against log events, and inspect correlation state.