Damian Conway's vmath plugin for vim as demonstrated at his OSCON 2013 "More Instantly Better Vim" presentation. Calculates the sum, average, min, and max for a visual region containing numbers.
Recommended using tpope's pathogen:
cd ~/.vim/bundle
git clone git://github.com/lionelyoung/vim-instantlybettervim2013
These commands are available to you:
"====[ dragvisuals.vim ]===============
vmap <expr> <LEFT> DVB_Drag('left')
vmap <expr> <RIGHT> DVB_Drag('right')
vmap <expr> <DOWN> DVB_Drag('down')
vmap <expr> <UP> DVB_Drag('up')
vmap <expr> D DVB_Duplicate()
"====[ listtrans.vim ]===============
nmap ;l :call ListTrans_toggle_format()<CR>
vmap ;l :call ListTrans_toggle_format('visual')<CR>