Jbuilder

InventList is the public home for indie builders. Log every ship (releases, features, bug fixes), build Series with live embeds of your actual work, keep a journey dashboard, and share your story in one permanent place. Includes a CLI for shipping from the terminal, roadmaps, collections, and a weekly "What Shipped This Week" digest. Free forever, built for operators-of-one who ship in public.

Transactional email server with a lovely web interface

Free, open source mental health communication web app to share experiences with loved ones

Self-hosted music streaming server for playing your own audio library from any device, built as a Rails app.

:circus_tent: An open source forum/community system based on Rails, developed based on Ruby China.

Kanban board tool from 37signals for tracking work visually across a team, built with the same simplicity ethos as their other products.

The web application framework that powers this entire directory - convention over configuration, batteries included.