Here's a useful tool I found on reddit this morning - an R package called phenoScreen.
It's set up to make working with lab data from 96 or 384-well plates easier to work with and visualize. I'm not really sure how most people produced plate maps otherwise without spending hours reinventing wheels.
On that note, isn't there anything else we could start reinventing? The wheel has been around for at least six millenia. Perhaps we could start reinventing toasters.