SitemapGenerator is a framework-agnostic XML Sitemap generator written in Ruby with automatic Rails integration. It supports Video, News, Image, Mobile, PageMap and Alternate Links sitemap extensions and includes Rake tasks for managing your sitemaps, as well as many other great features.
Currently it is forcing S3 bucket to have acl = public read, which is not desired for some setup.
It'll be helpful to be able to disable that option.
https://github.com/kjvarga/sitemap_generator/blob/aa69709ac631466b1d7562195343e7cffe1b5b59/lib/sitemap_generator/adapters/aws_sdk_adapter.rb#L43