Various templates, images, and useful scripts for LaTeX.
In templates there are/will be templates for articles, posters, etc.
In images there are various logos for use in talks / posters. Copyright for the various logos belongs to the respective universities / organisations.
In scripts there is a useful script for checking for bibtex entries with missing DOIs. I generally use it to update the bibtex between writing the preprint and submitting to a journal, or when updating the arXiv version after acceptance.
In bibtex I keep my personal bibtex style file - based on the JHEP one (which is also present for comparison and history), but with a few changes I've made.