Arroyo is a distributed stream processing engine built in Rust, designed for real-time data analysis with stateful operations. It supports high-volume event processing, SQL-based pipelines, and can be run locally or in the cloud. Use cases include fraud detection and real-time analytics.

Rill is a business intelligence tool that allows data engineers and analysts to create fast, self-service dashboards directly from raw data lakes, using its embedded in-memory database for rapid querying. It supports various data sources and provides a metrics layer for standardized business metrics, enabling real-time insights and integration with AI systems. Rill emphasizes ease of use with features like SQL-based definitions, YAML configuration, and Git integration for version control.