Jeeves is a personal valet for your Ruby code. It is used to manage dependencies between loosely coupled classes via explicit declaraion. It is _not_ a traditional dependency injection framework, although it can easily fill that role.

MinDI is minimalist in that it attempts to map concepts of dependency injection into basic ruby constructs, rather than into a layer of specialized constructs.

Basic but powerful dependency injection for Ruby.

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

Simple dependency injection framework for ruby applications

Lazy Dependency Injection. Dependencies are allocated only when needed, optimizing performance.

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

GlueGun makes dependency injection and hydration a first-order concern

Dependency configuration and injection for Ruby and Rails.

DI principles and idioms realized in scope of Ruby.Support for method-injeciton strategy, container-based dependency resolving, static and dynamic bindings and etc.