Here is my gpa calculator app in rails. cgpacalc.herokuapp.com with some bootstrap. It calculates the gpa and allow users to signup and save their marksheets for their future references. some vim tips: I used vim editor for this development. There is a plugin called vim-rails it can make the development much easier. vi editor should be on your box. need to install vim-pathogen before installing vim-rails mkdir -p ~/.vim/autoload ~/.vim/bundle; \ curl -LSso ~/.vim/autoload/pathogen.vim \ https://raw.github.com/tpope/vim-pathogen/master/autoload/pathogen.vim then add this on .vimrc file execute pathogen#infect() after that we can install vim-rails by cd ~/.vim/bundle git clone git://github.com/tpope/vim-rails.git git clone git://github.com/tpope/vim-bundler.git open vim and type :Rails Baisc commands: :Rmodel user :Rcontroller application :Rhelper navigation :Rview sessions/new :Rfunctionaltest sessions :Runittest user