Vagrant is a tool for building and distributing development environments.

Deploy web apps anywhere.

A performance dashboard for Postgres

Sequel: The Database Toolkit for Ruby

Large scale server deploys using BitTorrent and the BitTornado library (NOTE: project no longer maintained)

Goliath is a non-blocking Ruby web server framework

Reflow automatically creates pull requests, ensures the code review is approved, and squash merges finished branches to master with a great commit message template.

Higher-level data structures built on Redis