Gennaro is a skeleton generator for Sinatra, Padrino or what you want.
As built-in skeleton it currently provides authentication, a UI-complete user management template, but you are free to add any template you want.
$ gem install gennaro
Generate the authentication skeleton for your app named App in the current path
$ gennaro -g authentication
Generate the authentication skeleton for your app named Example the folder server
$ gennaro -g authentication -c Example -p server
Use some other standalone skeleton
$ gennaro -g mycoolskeleton -c Example -p server -t my_templates
Show all the built-in skeletons
$ gennaro -l
Show the help
$ gennaro -h