There are over 35,000 free themes in the WordPress repository, and thousands more premium themes sold by the developers on their own sites and marketplace.
I cannot consciously recommend WordPress themes I have not thoroughly used, so this post will be a constant work-in-progress.
Astra
Astra is a very popular WordPress theme, which had lots of documentation and support. The content section is wide by default, with no sidebars. This is my go-to theme when I want to build a new webcam site quickly.