In worldarxiv.py you can find the script that is responsible for scraping new papers from the "new" page of arxiv.org (e.g. for astro-ph this is at https://arxiv.org/list/astro-ph/new ) and packaging it into a dumb json file for the client to use.
In client/ is the code for displaying the page at worldarxiv.org.
In order to run worldarxiv.py you will need API keys for google maps and the Harvard ADS service (https://ui.adsabs.harvard.edu/)
All the affiliation info from worldarxiv.org is at best a reasonable guess and shouldn't be considered always correct. The "correct" affiliation is almost always in the PDF of the actual paper. See this issue for more info.
I am very open to pull requests and feature requests.