Cardinal AI is a local, per-repo AI Kanban tool: columns are policies, cards become Claude-powered worker agents, and work ships as pull requests. Run `cardinal` inside any git repository to get a board for it at http://localhost:4000.

🐻 Watch your back! Young man.

chats is a drop-in gem to add chat messaging to your Rails app. It implements a real-time messaging engine for Ruby on Rails 8+ apps: direct messages (DMs), group chats, image attachments, emoji reactions, read receipts, unread badges, and typing indicators. All rendered server-side and updated live with Hotwire (Turbo Streams over Action Cable), so it ships with zero custom JavaScript build steps and works with importmaps out of the box. Any model can converse via a single `acts_as_messager` macro (users, organizations, support agents — participants are polymorphic), conversations can be optionally attached to any domain record via `acts_as_chat_subject` (so users can chat about a specific order, a listing, a booking), and the whole inbox UI is overridable view-by-view like Devise. It exposes small adapter seams a blocked-users lookup, a `can_message` policy, and a notifier hook; so it snaps onto the `moderate` gem for Trust & Safety (report/block/filter, DSA + app-store compliance) and onto any notification system (like the `noticed` gem) without any hard dependencies. Messages support soft deletion, editing, system messages posted by your app, per-sender rate limiting, and optional encryption at rest.

A mountable Rails CMS engine. Multi-site, multilingual, content blocks, page tree, media management, forms, headless JSON API, and webhooks.

A unified platform for knowledge, task management, and chat communication with AI Agents

CompletionKit is a prompt testing platform that runs as a Rails engine or a standalone app. Run prompts against real datasets, score every output with an LLM judge against criteria you define, track prompt versions, and get AI-generated improvement suggestions grounded in your actual results. Includes a web UI, REST API, and a built-in MCP server with 34 tools.

A Rails engine providing cookie consent modal, preferences management, and localization using Turbo Streams.

A Rails Engine for collaborative plan review with AI-powered feedback.

Easy and powerful popover system for Ruby On Rails.

CoverageBook component library

Crudable Rails provides everything needed to quickly build fully functional CRUD-based controllers in a Rails application. It streamlines resource management, reduces boilerplate, and enforces best practices for handling requests, responses, and strong parameters. Ideal for developers looking to accelerate Rails development while maintaining flexibility and clean architecture.

Easy tables with filters

Databasium is a Rails engine for helping Rails developers with managing database. It provides Rails application with 4 primary resources: - Records: to create, read, update and delete data in your database. - Migrations: to manage database migrations. - Models: to manage Active Record models. - Schema: generates entity-relationship diagram(ERD) of database from Active Record models. It is intended to be used only in development environment. It is not meant to be used in production. For security reasons it will try to abort application when it is tried to be used in production, just to be sure :).

A mountable Rails engine that provides a full-featured web interface for documenting database schemas — tables, columns, relationships, constraints, change tracking, ER diagrams, Excel export, and i18n support (EN/JA).

Stages perform_later into a dedicated table, runs a tick loop that admits jobs through declared gates (throttle, concurrency), then forwards survivors to the real ActiveJob adapter. Embedded as a periodic job. Compatible with good_job and solid_queue.

EasyAdmin provides a straightforward way to add an admin panel to your Rails project.

ElaineCrud provides a reusable BaseController and views to quickly generate CRUD interfaces for any ActiveRecord model with minimal configuration.

Essence is an open-source framework that provides ViewComponents, form styles and other functionality for apps designed and developed for the online shop software Beyond

Evematic is a full-stack toolkit for building third party applications for EVE Online with Ruby on Rails.

Exception logging and management