Basically, Scimax is the collection of (mostly) Elisp utilities that Kitchin has put together to help with his group's writing and publishing of papers. It features using Org mode to write the papers in a reproducible research way and then publish them to the format required by the journal they are submitting the paper to. There are also some tools to aid in teaching. For more details, check out Kitchin's Scimax page.
The nice thing about Scimax is that all the utilities are packaged up into a single project repository that anyone interested can download and use. The project is hosted on Github if you're interested.