The New Relic Plugin Gem is used to send plugin data to New Relic from non-application sources.

Provides support to utilize the OpenSRS API with Ruby.

Organize ActiveRecord model into a tree structure using PostgreSQL LTree

Easily write arbitrary filters

This Pry plugin enables inline variables view like RubyMine!

Private Puppet forge server supports local files, both v1 and v3 API proxies

Retrofits and generates valid puppet rspec test code to existing modules

As of OSX 10.9 Safari can receive push notifications when it is closed.

Quality is a tool that runs quality checks on your code using community tools, and makes sure your numbers don't get any worse over time. Just add 'rake quality' as part of your Continuous Integration

Debugging toolbar for Rack applications implemented as middleware. Based on logical-insight and rack-bug.

Declaratively filter data via URL params, in any Rack app.

One more solution to create charts in Ruby on Rails application

Record Cache for Rails 3

A Resque plugin. Two or more jobs with the same lock cannot be processed simultaneously by multiple workers. When this situation occurs the second job gets pushed back to the queue.

Roles.

Asynchronous web crawler, scraper and file harvester

Adds multipart support (SOAP with Attachments) to Savon

This plugin provides native Redis instrumentation for monitoring and metrics collection, including: service health, database connectivity, replication status, `INFO` metrics, key counts, list lengths, and more.

This plugin provides native SNMP instrumentation for monitoring and metrics collection, including: generic OID single/bulk query for status and metrics, and ifTable metrics.

This plugin provides native SSL instrumentation for monitoring, including: hostname and chain verification, cert and crl expiry, and Qualys SSL Labs reporting