I would consider Emacs to be the granddad of "computational scratchpads". Being able to run a repl in a buffer, tangle code blocks in org-mode, create buffers a

I would consider Emacs to be the granddad of "computational scratchpads". Being able to run a repl in a buffer, tangle code blocks in org-mode, create buffers against which to run code, etc. Plus the calculator is fire.