Gem-prune is a project mainly written in Ruby, it's free.
Adds a 'prune' command to rubygems to help keep things tidy.
Keep your local gem installation from growing wild.
$ gem install gem-prune# keep the latest sinatra
$ gem keep sinatra
# keep the latest rails and one from the 2.3 series
$ gem keep rails
$ gem keep rails -v "~> 2.3.0"
# remove unwanted gems
$ gem pruneMIT License
Copyright (c) 2010 David Dollar. See LICENSE for details.