Rubto

Rubto is an open-source software framework for declarative data transformation and streaming. It aims to provide a compact toolchain for building data pipelines that can run on desktops and servers with limited resources. The project centers on Rubto Script, a domain-specific language that expresses data flows as a sequence of transformations on streams and datasets. Outputs can be produced in standard formats such as JSON and CSV, and Rubto supports both batch and real-time processing.

Rubto's architecture consists of a core engine, a compiler for Rubto Script, and a set of pluggable backends for I/O and formats. The core handles scheduling, error handling, and streaming semantics, while backends provide adapters to file systems, message queues, and cloud storage. The system emphasizes a small footprint, cold-start performance, and deterministic behavior, useful for reproducible data workflows.

Interoperability: Bindings exist to expose Rubto functionality to Python and JavaScript runtimes, enabling integration with existing data analysis environments. The runtime can execute compiled scripts efficiently on modern hardware, with multi-threaded or asynchronous execution models.

Rubto was released in 2020 by the Rubto Project Collective. It has a modest community of users and contributors and is primarily adopted in academic or hobbyist projects exploring minimal tooling for data pipelines. The documentation covers installation, the Rubto Script syntax, and a library of example scripts. Development activity focuses on expanding backend support and improving error messages.