Download Cell-mode and place it in your load path. Then:

(require 'cell) (add-to-list 'auto-mode-alist (cons "\\.cell" 'cell-mode))

And try opening a new file, for example "/home/dto/test.cell". Or use M-x cell-sheet-create.

Use "Control-H m" to get help on the keybindings.

To byte-compile and load cell-mode in one step, use:

(byte-compile-file "/path/to/cell.el" t)