attr_inject is a simple dependency injection solution for ruby.

Dependency Injection that won't make your head spin

Dependency Injection that allows you to generate pre-configured classes

A lightweight dependency injection container for Ruby

If you needs a dependency injection container for Ruby, try use syringe.

Koine DI, for your dependency injection. Dependency injection container

A simple Dependency Injection container for Ruby.

Simple dependency injection for Rails.

Yep is a dependency injection framework written in ruby

ActiveDryDeps not modify constructor and support Dependency Injection for modules. Also you can import method from any object in your container. Adding extra dependencies is easy and improve readability your code.

Guice-ish dependency injection library for Ruby

A gem to handle dependency injection on ruby applications

S2Container is a Dependency Injection(DI) and Aspect Oriented Programming(AOP) implementation, written in Ruby

Value containers supporting nested dot.notation access over hashes, and utilities offering dependency injection/lookup, and language extensions support running in a non-rails environment. Plus, examples of null objects, class customization, and concurrent processing. Review the RSpec tests, and or review the README for more details.

Simple dependency injection for ruby objects

Periodico is a lightweight pub/sub framework that leverages self-registration and dependency injection to communicate events to subscribers.

Encase is a library for using dependency injection within ruby applications. It provides a lightweight IOC Container that manages dependencies between your classes. It was written to assist with wiring of domain objects outside Rails applications to enable faster test suites.

A small library to help you manage services with dependency injection.

Inoculate is a small, thread-safe dependency injection library configured entirely with Ruby. It provides several life-cycles and provides dependency access through private accessors.

SmartInject is a minimalist, flexible and efficient dependency injection for Ruby based on constructor injection, one of the most used method for DI. SmartInject is intented to be under your control. No magic here.