A very basic Ruby gem skeleton generator empowered by Jeweler. Fits most needs.
sudo gem install grimen-gemgen
Example:
gemgen my_cool_gem grimen grimen@gmail.com 'Jonas Grimfelt' 2008-2009
…or more general:
gemgen GEM_NAME [AUTHOR_GITHUB_ALIAS] [AUTHOR_EMAIL] ['AUTHOR_FULL_NAME'] [COPYRIGHT_YEAR(S)]
Copyright © Jonas Grimfelt, released under the MIT-license.