Bundler manages an application's dependencies through its entire life, across many machines, systematically and repeatably

Manages a Chef cookbook's dependencies

Isolate is a very simple RubyGems sandbox. It provides a way to express and automatically install your project's Gem dependencies.

A Framework for Bundlers.

A simple tool for tracking vendor branches in git.

Add the latest version of a gem to your Gemfile from the command line.

Giternal provides dead-simple management of external git dependencies. It only stores a small bit of metadata, letting you actively develop in any of the repos. Come deploy time, you can easily freeze freeze all the dependencies to particular versions

Use Ruby gems and mock require statements within RubyMotion applications

Piston makes it easy to merge vendor branches into your own repository, without worrying about which revisions were grabbed or not. Piston will also keep your local changes in addition to the remote changes.

drop in replacement for bundler

Bundler for non-Ruby dependencies from Homebrew

CheckZilla is a command line tool allowing you to check and be notified of outdated software.

Quickly freeze and unfreeze external git dependencies