Is it possible to integrate autoresponder Aweber.com or MailerLite.com?
Can I integrate a facebook bot?
Can I integrate a LiveChat?
Can I create areas reserved for members only?
I can integrate with Google google recaptcha
Can I change the style of the Buttons or something else?
Can I integrate pages with Wordpress?
Can I integrate with Cookie Policy and GDPR bar?
You can use any html, php, css, etc, etc with RW. Thus, If you can find code, addon, and/or system that does what you want you can put it on your html/php page. There are some stacks that work with the Stacks3 (soon to be Stacks4) addon that do exactly what you want.
I have 3rd party index/search running on my site and a 3rd party cart. I also code my own sitewide php “includes”.
As for Stacks… I wouldn’t consider using RapidWeaver without it. If RW is a “10” out of the box, Stacks3/4 makes it a “100” http://yourhead.com/stacks/
Stacks is essential a system that allows 3rd parties (you?) to creat code snippets to add to RW and having an interface for option settings, etc. Just search the web for “Rapidweaver Stacks”