A UI for James Golick's rollout gem

Sufia extends the robust Hydra framework to provide a user interface around common repository features and social features. Sufia offers self-deposit, proxy deposit, and configurable mediated deposit workflows. Sufia delivers its rich and growing set of features via a modern, responsive UI

Cobweb is a web crawler that can use resque to cluster crawls to quickly crawl extremely large sites which is much more performant than multi-threaded crawlers. It is also a standalone crawler that has a sophisticated statistics monitoring interface to monitor the progress of the crawls.

A Ruby gem to verify the signature of Firebase ID Tokens. It uses Redis to store Google's x509 certificates and manage their expiration time, so you don't need to request Google's API in every execution and can access it as fast as reading from memory.

Ruby Adapter for Raygun

A nifty service layer for your Rails app

Open-source gems maintenance & maturity tracking

Related is a Redis-backed high performance distributed graph database.

A simple API caching layer built on top of HTTParty and Redis

A simple API caching layer built on top of HTTParty and Redis

Wraps memcached, redis(-namespace), memcache-client, dalli and handles their weirdnesses, including forking

Linearly scale Heroku dyno counts based on sampled metrics

A simple event bus on top of Sidekiq. Publish and subscribe to events as they occur through a queue.

A fair way to queue work in multi-user systems.

istox backend shared gem

initiate a M-Pesa transaction on behalf of a customer using STK Push.

Pushr daemon for push notification services like APNS (iOS/Apple) and GCM (Android).

Fast and unobtrusive activity tracking of ActiveRecord models using DataMapper and Redis

Provides multi-step tasks with finalization and progress tracking

Simple business process/transactions tracking and metrics service