This addon will add a block at checkout_succes (after a customer has placed and confirmed their order), that allow the customer to subscribe to your stores newsletter.
If a customer is already subscribed, the block will not show.

Can be installed with the Zipur-bundler. Readme included for manual install

This content module will display products from the same category on the product info page. Handy if you have a lot of products and find it unfeasible to manually add them individually using the related products addon