Module which show products from the same category on product page is

https://github.com/PrestaShop/ps_categoryproducts

Module which show viewed products on product page is

https://github.com/PrestaShop/ps_viewedproduct/

They are ps core modules if you want to use them you need to download from github and upload to your prestashop or you can instll directly from backoffice by typing in modules catalog their names ps_categoryproducts or ps_viewedproduct