Fluentd: Unified Logging Layer (project under CNCF)

Effing package management! Build packages for multiple platforms (deb, rpm, etc) with great ease and sanity.

Server automation framework and application

The Listen gem listens to file modifications and notifies you about the changes.

Smarter Puppet deployment

A client for Kafka 0.8

Auto-generate bindings for GObject based libraries at run time using FFI

An event and metrics fast-forwarding agent.

A tool to help you automate semantic versioning in your project

A small and pure ruby css generator with advanced features