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.

Yep is a dependency injection framework written in ruby

Dinja, Dependency Injection Ninja allows you to decouple abstractions from implementations

A simple dependency injection framework for ruby

Simple dependency injection for ruby objects

Dependency injection framework for ruby

Dependency injection container compatible with the SOAR Ruby framework

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.

Alki (AL-kai) is a Dependency Injection framework for Ruby. Helps organize and scale your project, so you can focus on the important stuff.

StructureMap is a Dependency Injection / Inversion of Control tool for .Net that can be used to improve the architectural qualities of an object oriented system by reducing the mechanical costs of good design techniques

A gem to handle dependency injection on ruby applications

Racket Registry is an easy-to-use container lib for most of your dependency injection container needs.

Minimal dependency injection container for Ruby

Needle is a Dependency Injection/Inversion of Control container for Ruby. It supports both type-2 (setter) and type-3 (constructor) injection. It takes advantage of the dynamic nature of Ruby to provide a rich and flexible approach to injecting dependencies.

Plugin system for Rails built around a Dependency Injection Container

ObjectInjection is dependency injection container.

Simple dependency injection framework for ruby applications

Unity is a Dependency Injection container for .NET

Simple dependency injection for Ruby classes

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