Solidus

Solidus is a Ruby on Rails‑based e‑commerce platform that can be self‑hosted and run without subscription fees. It bundles a set of gems—core models and mailers, a RESTful API, an admin backend, and sample data—to provide a complete storefront, order management, and integration points out of the box. The architecture is deliberately extensible, allowing developers to modify or replace any component to fit custom business logic or niche industry requirements.

The software targets merchants, developers, and enterprises that need full control over the checkout, catalog, and fulfillment processes. Because it is open source under a BSD‑3‑Clause license, users can host it on their own infrastructure, audit the code, and contribute improvements. The community supplies documentation, guides, and a Slack channel for support, while a primary contributor coordinates development and releases.

Distinctive aspects include a modular gem composition, a built‑in subscription engine, a flexible promotion system, and internationalization support that lets stores scale from small operations to large, multi‑region enterprises while maintaining performance and customizability.